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771
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1 /* Conversion functions for I18N encodings, but not Unicode (in separate file).
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2 Copyright (C) 1991, 1995 Free Software Foundation, Inc.
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3 Copyright (C) 1995 Sun Microsystems, Inc.
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4 Copyright (C) 2000, 2001, 2002 Ben Wing.
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5
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6 This file is part of XEmacs.
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7
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8 XEmacs is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 2, or (at your option) any
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11 later version.
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12
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13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with XEmacs; see the file COPYING. If not, write to
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20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 Boston, MA 02111-1307, USA. */
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22
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23 /* Synched up with: Mule 2.3. Not in FSF. */
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24
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25 /* For previous history, see file-coding.c.
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26
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27 September 10, 2001: Extracted from file-coding.c by Ben Wing.
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28
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29 Later in September: Finished abstraction of detection system, rewrote
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30 all the detectors to include multiple levels of likelihood.
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31 */
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32
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33 #include <config.h>
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34 #include "lisp.h"
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35
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36 #include "charset.h"
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37 #include "mule-ccl.h"
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38 #include "file-coding.h"
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39
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40 Lisp_Object Qshift_jis, Qiso2022, Qbig5, Qccl;
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41
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42 Lisp_Object Qcharset_g0, Qcharset_g1, Qcharset_g2, Qcharset_g3;
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43 Lisp_Object Qforce_g0_on_output, Qforce_g1_on_output;
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44 Lisp_Object Qforce_g2_on_output, Qforce_g3_on_output;
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45 Lisp_Object Qno_iso6429;
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46 Lisp_Object Qinput_charset_conversion, Qoutput_charset_conversion;
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47 Lisp_Object Qshort, Qno_ascii_eol, Qno_ascii_cntl, Qseven, Qlock_shift;
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48
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49 Lisp_Object Qiso_7, Qiso_8_designate, Qiso_8_1, Qiso_8_2, Qiso_lock_shift;
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50
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51
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52 /************************************************************************/
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53 /* Shift-JIS methods */
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54 /************************************************************************/
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55
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56 /* Shift-JIS; Hankaku (half-width) KANA is also supported. */
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57 DEFINE_CODING_SYSTEM_TYPE (shift_jis);
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58
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59 /* Shift-JIS is a coding system encoding three character sets: ASCII, right
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60 half of JISX0201-Kana, and JISX0208. An ASCII character is encoded
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61 as is. A character of JISX0201-Kana (DIMENSION1_CHARS94 character set) is
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62 encoded by "position-code + 0x80". A character of JISX0208
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63 (DIMENSION2_CHARS94 character set) is encoded in 2-byte but two
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64 position-codes are divided and shifted so that it fit in the range
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65 below.
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66
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67 --- CODE RANGE of Shift-JIS ---
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68 (character set) (range)
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69 ASCII 0x00 .. 0x7F
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70 JISX0201-Kana 0xA0 .. 0xDF
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71 JISX0208 (1st byte) 0x80 .. 0x9F and 0xE0 .. 0xEF
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72 (2nd byte) 0x40 .. 0x7E and 0x80 .. 0xFC
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73 -------------------------------
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74
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75 */
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76
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77 /* Is this the first byte of a Shift-JIS two-byte char? */
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78
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826
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79 inline static int
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80 byte_shift_jis_two_byte_1_p (int c)
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81 {
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82 return (c >= 0x81 && c <= 0x9F) || (c >= 0xE0 && c <= 0xEF);
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83 }
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771
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84
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85 /* Is this the second byte of a Shift-JIS two-byte char? */
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86
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826
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87 inline static int
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88 byte_shift_jis_two_byte_2_p (int c)
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89 {
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90 return (c >= 0x40 && c <= 0x7E) || (c >= 0x80 && c <= 0xFC);
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91 }
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92
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93 inline static int
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94 byte_shift_jis_katakana_p (int c)
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95 {
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96 return c >= 0xA1 && c <= 0xDF;
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97 }
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771
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98
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99 /* Convert Shift-JIS data to internal format. */
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100
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101 static Bytecount
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102 shift_jis_convert (struct coding_stream *str, const UExtbyte *src,
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103 unsigned_char_dynarr *dst, Bytecount n)
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104 {
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105 unsigned int ch = str->ch;
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106 Bytecount orign = n;
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107
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108 if (str->direction == CODING_DECODE)
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109 {
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110 while (n--)
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111 {
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112 UExtbyte c = *src++;
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113
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114 if (ch)
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115 {
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116 /* Previous character was first byte of Shift-JIS Kanji char. */
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826
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117 if (byte_shift_jis_two_byte_2_p (c))
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771
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118 {
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867
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119 Ibyte e1, e2;
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771
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120
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121 Dynarr_add (dst, LEADING_BYTE_JAPANESE_JISX0208);
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122 DECODE_SHIFT_JIS (ch, c, e1, e2);
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123 Dynarr_add (dst, e1);
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124 Dynarr_add (dst, e2);
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125 }
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126 else
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127 {
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128 DECODE_ADD_BINARY_CHAR (ch, dst);
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129 DECODE_ADD_BINARY_CHAR (c, dst);
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130 }
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131 ch = 0;
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132 }
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133 else
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134 {
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826
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135 if (byte_shift_jis_two_byte_1_p (c))
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771
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136 ch = c;
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826
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137 else if (byte_shift_jis_katakana_p (c))
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771
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138 {
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139 Dynarr_add (dst, LEADING_BYTE_KATAKANA_JISX0201);
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140 Dynarr_add (dst, c);
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141 }
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142 else
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143 DECODE_ADD_BINARY_CHAR (c, dst);
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144 }
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145 }
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146
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147 if (str->eof)
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148 DECODE_OUTPUT_PARTIAL_CHAR (ch, dst);
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149 }
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150 else
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151 {
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152 while (n--)
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153 {
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867
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154 Ibyte c = *src++;
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826
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155 if (byte_ascii_p (c))
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771
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156 {
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157 Dynarr_add (dst, c);
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158 ch = 0;
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159 }
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867
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160 else if (ibyte_leading_byte_p (c))
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771
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161 ch = (c == LEADING_BYTE_KATAKANA_JISX0201 ||
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162 c == LEADING_BYTE_JAPANESE_JISX0208_1978 ||
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163 c == LEADING_BYTE_JAPANESE_JISX0208) ? c : 0;
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164 else if (ch)
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165 {
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166 if (ch == LEADING_BYTE_KATAKANA_JISX0201)
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167 {
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168 Dynarr_add (dst, c);
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169 ch = 0;
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170 }
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171 else if (ch == LEADING_BYTE_JAPANESE_JISX0208_1978 ||
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172 ch == LEADING_BYTE_JAPANESE_JISX0208)
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173 ch = c;
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174 else
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175 {
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176 UExtbyte j1, j2;
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177 ENCODE_SHIFT_JIS (ch, c, j1, j2);
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178 Dynarr_add (dst, j1);
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179 Dynarr_add (dst, j2);
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180 ch = 0;
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181 }
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182 }
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183 }
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184 }
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185
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186 str->ch = ch;
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187
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188 return orign;
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189 }
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190
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191 DEFUN ("decode-shift-jis-char", Fdecode_shift_jis_char, 1, 1, 0, /*
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192 Decode a JISX0208 character of Shift-JIS coding-system.
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193 CODE is the character code in Shift-JIS as a cons of type bytes.
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194 Return the corresponding character.
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195 */
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196 (code))
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197 {
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198 int c1, c2, s1, s2;
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199
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200 CHECK_CONS (code);
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201 CHECK_INT (XCAR (code));
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202 CHECK_INT (XCDR (code));
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203 s1 = XINT (XCAR (code));
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204 s2 = XINT (XCDR (code));
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826
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205 if (byte_shift_jis_two_byte_1_p (s1) &&
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206 byte_shift_jis_two_byte_2_p (s2))
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771
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207 {
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208 DECODE_SHIFT_JIS (s1, s2, c1, c2);
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867
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209 return make_char (make_ichar (Vcharset_japanese_jisx0208,
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831
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210 c1 & 0x7F, c2 & 0x7F));
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771
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211 }
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212 else
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213 return Qnil;
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214 }
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215
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216 DEFUN ("encode-shift-jis-char", Fencode_shift_jis_char, 1, 1, 0, /*
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217 Encode a JISX0208 character CHARACTER to SHIFT-JIS coding-system.
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218 Return the corresponding character code in SHIFT-JIS as a cons of two bytes.
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219 */
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220 (character))
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221 {
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222 Lisp_Object charset;
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223 int c1, c2, s1, s2;
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224
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225 CHECK_CHAR_COERCE_INT (character);
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867
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226 BREAKUP_ICHAR (XCHAR (character), charset, c1, c2);
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771
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227 if (EQ (charset, Vcharset_japanese_jisx0208))
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228 {
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229 ENCODE_SHIFT_JIS (c1 | 0x80, c2 | 0x80, s1, s2);
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230 return Fcons (make_int (s1), make_int (s2));
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231 }
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232 else
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233 return Qnil;
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234 }
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235
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236
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237 /************************************************************************/
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238 /* Shift-JIS detector */
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239 /************************************************************************/
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240
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241 DEFINE_DETECTOR (shift_jis);
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242 DEFINE_DETECTOR_CATEGORY (shift_jis, shift_jis);
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243
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244 struct shift_jis_detector
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245 {
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246 int seen_jisx0208_char_in_c1;
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247 int seen_jisx0208_char_in_upper;
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248 int seen_jisx0201_char;
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249 unsigned int seen_iso2022_esc:1;
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250 unsigned int seen_bad_first_byte:1;
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251 unsigned int seen_bad_second_byte:1;
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252 /* temporary */
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253 unsigned int in_second_byte:1;
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254 unsigned int first_byte_was_c1:1;
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255 };
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256
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257 static void
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258 shift_jis_detect (struct detection_state *st, const UExtbyte *src,
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259 Bytecount n)
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260 {
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261 struct shift_jis_detector *data = DETECTION_STATE_DATA (st, shift_jis);
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262
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263 while (n--)
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264 {
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265 UExtbyte c = *src++;
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266 if (!data->in_second_byte)
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267 {
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268 if (c >= 0x80 && c <= 0x9F)
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269 data->first_byte_was_c1 = 1;
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270 if (c >= 0xA0 && c <= 0xDF)
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271 data->seen_jisx0201_char++;
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272 else if ((c >= 0x80 && c <= 0x9F) || (c >= 0xE0 && c <= 0xEF))
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273 data->in_second_byte = 1;
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274 else if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO)
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275 data->seen_iso2022_esc = 1;
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276 else if (c >= 0x80)
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277 data->seen_bad_first_byte = 1;
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278 }
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279 else
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280 {
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281 if ((c >= 0x40 && c <= 0x7E) || (c >= 0x80 && c <= 0xFC))
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282 {
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283 if (data->first_byte_was_c1 || (c >= 0x80 && c <= 0x9F))
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284 data->seen_jisx0208_char_in_c1++;
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285 else
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286 data->seen_jisx0208_char_in_upper++;
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287 }
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288 else
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289 data->seen_bad_second_byte = 1;
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290 data->in_second_byte = 0;
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291 data->first_byte_was_c1 = 0;
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292 }
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293 }
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294
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295 if (data->seen_bad_second_byte)
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296 DET_RESULT (st, shift_jis) = DET_NEARLY_IMPOSSIBLE;
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297 else if (data->seen_bad_first_byte)
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298 DET_RESULT (st, shift_jis) = DET_QUITE_IMPROBABLE;
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299 else if (data->seen_iso2022_esc)
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300 DET_RESULT (st, shift_jis) = DET_SOMEWHAT_UNLIKELY;
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301 else if (data->seen_jisx0208_char_in_c1 >= 20 ||
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302 (data->seen_jisx0208_char_in_c1 >= 10 &&
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303 data->seen_jisx0208_char_in_upper >= 10))
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304 DET_RESULT (st, shift_jis) = DET_QUITE_PROBABLE;
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305 else if (data->seen_jisx0208_char_in_c1 > 3 ||
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306 data->seen_jisx0208_char_in_upper >= 10 ||
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307 /* Since the range is limited compared to what is often seen
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308 is typical Latin-X charsets, the fact that we've seen a
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309 bunch of them and none that are invalid is reasonably
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310 strong statistical evidence of this encoding, or at least
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311 not of the common Latin-X ones. */
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312 data->seen_jisx0201_char >= 100)
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313 DET_RESULT (st, shift_jis) = DET_SOMEWHAT_LIKELY;
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314 else if (data->seen_jisx0208_char_in_c1 > 0 ||
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315 data->seen_jisx0208_char_in_upper > 0 ||
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316 data->seen_jisx0201_char > 0)
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317 DET_RESULT (st, shift_jis) = DET_SLIGHTLY_LIKELY;
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318 else
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319 DET_RESULT (st, shift_jis) = DET_AS_LIKELY_AS_UNLIKELY;
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|
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320 }
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321
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322
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323 /************************************************************************/
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|
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324 /* Big5 methods */
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325 /************************************************************************/
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326
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327 /* BIG5 (used for Taiwanese). */
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328 DEFINE_CODING_SYSTEM_TYPE (big5);
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329
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330 /* BIG5 is a coding system encoding two character sets: ASCII and
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331 Big5. An ASCII character is encoded as is. Big5 is a two-byte
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332 character set and is encoded in two-byte.
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333
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|
|
334 --- CODE RANGE of BIG5 ---
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|
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335 (character set) (range)
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336 ASCII 0x00 .. 0x7F
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337 Big5 (1st byte) 0xA1 .. 0xFE
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338 (2nd byte) 0x40 .. 0x7E and 0xA1 .. 0xFE
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|
|
339 --------------------------
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340
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341 Since the number of characters in Big5 is larger than maximum
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342 characters in Emacs' charset (96x96), it can't be handled as one
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343 charset. So, in XEmacs, Big5 is divided into two: `charset-big5-1'
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344 and `charset-big5-2'. Both <type>s are DIMENSION2_CHARS94. The former
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345 contains frequently used characters and the latter contains less
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|
|
346 frequently used characters. */
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|
|
347
|
|
826
|
348 inline static int
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|
|
349 byte_big5_two_byte_1_p (int c)
|
|
|
350 {
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|
|
351 return c >= 0xA1 && c <= 0xFE;
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|
|
352 }
|
|
771
|
353
|
|
|
354 /* Is this the second byte of a Shift-JIS two-byte char? */
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|
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355
|
|
826
|
356 inline static int
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|
|
357 byte_big5_two_byte_2_p (int c)
|
|
|
358 {
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|
|
359 return (c >= 0x40 && c <= 0x7E) || (c >= 0xA1 && c <= 0xFE);
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|
|
360 }
|
|
771
|
361
|
|
|
362 /* Number of Big5 characters which have the same code in 1st byte. */
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|
|
363
|
|
|
364 #define BIG5_SAME_ROW (0xFF - 0xA1 + 0x7F - 0x40)
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|
|
365
|
|
|
366 /* Code conversion macros. These are macros because they are used in
|
|
|
367 inner loops during code conversion.
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|
|
368
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|
|
369 Note that temporary variables in macros introduce the classic
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|
|
370 dynamic-scoping problems with variable names. We use capital-
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|
|
371 lettered variables in the assumption that XEmacs does not use
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|
|
372 capital letters in variables except in a very formalized way
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|
|
373 (e.g. Qstring). */
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|
|
374
|
|
|
375 /* Convert Big5 code (b1, b2) into its internal string representation
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|
|
376 (lb, c1, c2). */
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|
|
377
|
|
|
378 /* There is a much simpler way to split the Big5 charset into two.
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|
|
379 For the moment I'm going to leave the algorithm as-is because it
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|
|
380 claims to separate out the most-used characters into a single
|
|
|
381 charset, which perhaps will lead to optimizations in various
|
|
|
382 places.
|
|
|
383
|
|
|
384 The way the algorithm works is something like this:
|
|
|
385
|
|
|
386 Big5 can be viewed as a 94x157 charset, where the row is
|
|
|
387 encoded into the bytes 0xA1 .. 0xFE and the column is encoded
|
|
|
388 into the bytes 0x40 .. 0x7E and 0xA1 .. 0xFE. As for frequency,
|
|
|
389 the split between low and high column numbers is apparently
|
|
|
390 meaningless; ascending rows produce less and less frequent chars.
|
|
|
391 Therefore, we assign the lower half of rows (0xA1 .. 0xC8) to
|
|
|
392 the first charset, and the upper half (0xC9 .. 0xFE) to the
|
|
|
393 second. To do the conversion, we convert the character into
|
|
|
394 a single number where 0 .. 156 is the first row, 157 .. 313
|
|
|
395 is the second, etc. That way, the characters are ordered by
|
|
|
396 decreasing frequency. Then we just chop the space in two
|
|
|
397 and coerce the result into a 94x94 space.
|
|
|
398 */
|
|
|
399
|
|
|
400 #define DECODE_BIG5(b1, b2, lb, c1, c2) do \
|
|
|
401 { \
|
|
|
402 int B1 = b1, B2 = b2; \
|
|
|
403 int I \
|
|
|
404 = (B1 - 0xA1) * BIG5_SAME_ROW + B2 - (B2 < 0x7F ? 0x40 : 0x62); \
|
|
|
405 \
|
|
|
406 if (B1 < 0xC9) \
|
|
|
407 { \
|
|
|
408 lb = LEADING_BYTE_CHINESE_BIG5_1; \
|
|
|
409 } \
|
|
|
410 else \
|
|
|
411 { \
|
|
|
412 lb = LEADING_BYTE_CHINESE_BIG5_2; \
|
|
|
413 I -= (BIG5_SAME_ROW) * (0xC9 - 0xA1); \
|
|
|
414 } \
|
|
|
415 c1 = I / (0xFF - 0xA1) + 0xA1; \
|
|
|
416 c2 = I % (0xFF - 0xA1) + 0xA1; \
|
|
|
417 } while (0)
|
|
|
418
|
|
|
419 /* Convert the internal string representation of a Big5 character
|
|
|
420 (lb, c1, c2) into Big5 code (b1, b2). */
|
|
|
421
|
|
|
422 #define ENCODE_BIG5(lb, c1, c2, b1, b2) do \
|
|
|
423 { \
|
|
|
424 int I = ((c1) - 0xA1) * (0xFF - 0xA1) + ((c2) - 0xA1); \
|
|
|
425 \
|
|
|
426 if (lb == LEADING_BYTE_CHINESE_BIG5_2) \
|
|
|
427 { \
|
|
|
428 I += BIG5_SAME_ROW * (0xC9 - 0xA1); \
|
|
|
429 } \
|
|
|
430 b1 = I / BIG5_SAME_ROW + 0xA1; \
|
|
|
431 b2 = I % BIG5_SAME_ROW; \
|
|
|
432 b2 += b2 < 0x3F ? 0x40 : 0x62; \
|
|
|
433 } while (0)
|
|
|
434
|
|
|
435 /* Convert Big5 data to internal format. */
|
|
|
436
|
|
|
437 static Bytecount
|
|
|
438 big5_convert (struct coding_stream *str, const UExtbyte *src,
|
|
|
439 unsigned_char_dynarr *dst, Bytecount n)
|
|
|
440 {
|
|
|
441 unsigned int ch = str->ch;
|
|
|
442 Bytecount orign = n;
|
|
|
443
|
|
|
444 if (str->direction == CODING_DECODE)
|
|
|
445 {
|
|
|
446 while (n--)
|
|
|
447 {
|
|
|
448 UExtbyte c = *src++;
|
|
|
449 if (ch)
|
|
|
450 {
|
|
|
451 /* Previous character was first byte of Big5 char. */
|
|
826
|
452 if (byte_big5_two_byte_2_p (c))
|
|
771
|
453 {
|
|
867
|
454 Ibyte b1, b2, b3;
|
|
771
|
455 DECODE_BIG5 (ch, c, b1, b2, b3);
|
|
|
456 Dynarr_add (dst, b1);
|
|
|
457 Dynarr_add (dst, b2);
|
|
|
458 Dynarr_add (dst, b3);
|
|
|
459 }
|
|
|
460 else
|
|
|
461 {
|
|
|
462 DECODE_ADD_BINARY_CHAR (ch, dst);
|
|
|
463 DECODE_ADD_BINARY_CHAR (c, dst);
|
|
|
464 }
|
|
|
465 ch = 0;
|
|
|
466 }
|
|
|
467 else
|
|
|
468 {
|
|
826
|
469 if (byte_big5_two_byte_1_p (c))
|
|
771
|
470 ch = c;
|
|
|
471 else
|
|
|
472 DECODE_ADD_BINARY_CHAR (c, dst);
|
|
|
473 }
|
|
|
474 }
|
|
|
475
|
|
|
476 if (str->eof)
|
|
|
477 DECODE_OUTPUT_PARTIAL_CHAR (ch, dst);
|
|
|
478 }
|
|
|
479 else
|
|
|
480 {
|
|
|
481 while (n--)
|
|
|
482 {
|
|
867
|
483 Ibyte c = *src++;
|
|
826
|
484 if (byte_ascii_p (c))
|
|
771
|
485 {
|
|
|
486 /* ASCII. */
|
|
|
487 Dynarr_add (dst, c);
|
|
|
488 }
|
|
867
|
489 else if (ibyte_leading_byte_p (c))
|
|
771
|
490 {
|
|
|
491 if (c == LEADING_BYTE_CHINESE_BIG5_1 ||
|
|
|
492 c == LEADING_BYTE_CHINESE_BIG5_2)
|
|
|
493 {
|
|
|
494 /* A recognized leading byte. */
|
|
|
495 ch = c;
|
|
|
496 continue; /* not done with this character. */
|
|
|
497 }
|
|
|
498 /* otherwise just ignore this character. */
|
|
|
499 }
|
|
|
500 else if (ch == LEADING_BYTE_CHINESE_BIG5_1 ||
|
|
|
501 ch == LEADING_BYTE_CHINESE_BIG5_2)
|
|
|
502 {
|
|
|
503 /* Previous char was a recognized leading byte. */
|
|
|
504 ch = (ch << 8) | c;
|
|
|
505 continue; /* not done with this character. */
|
|
|
506 }
|
|
|
507 else if (ch)
|
|
|
508 {
|
|
|
509 /* Encountering second byte of a Big5 character. */
|
|
|
510 UExtbyte b1, b2;
|
|
|
511
|
|
|
512 ENCODE_BIG5 (ch >> 8, ch & 0xFF, c, b1, b2);
|
|
|
513 Dynarr_add (dst, b1);
|
|
|
514 Dynarr_add (dst, b2);
|
|
|
515 }
|
|
|
516
|
|
|
517 ch = 0;
|
|
|
518 }
|
|
|
519 }
|
|
|
520
|
|
|
521 str->ch = ch;
|
|
|
522 return orign;
|
|
|
523 }
|
|
|
524
|
|
867
|
525 Ichar
|
|
771
|
526 decode_big5_char (int b1, int b2)
|
|
|
527 {
|
|
826
|
528 if (byte_big5_two_byte_1_p (b1) &&
|
|
|
529 byte_big5_two_byte_2_p (b2))
|
|
771
|
530 {
|
|
|
531 int leading_byte;
|
|
|
532 Lisp_Object charset;
|
|
|
533 int c1, c2;
|
|
|
534
|
|
|
535 DECODE_BIG5 (b1, b2, leading_byte, c1, c2);
|
|
826
|
536 charset = charset_by_leading_byte (leading_byte);
|
|
867
|
537 return make_ichar (charset, c1 & 0x7F, c2 & 0x7F);
|
|
771
|
538 }
|
|
|
539 else
|
|
|
540 return -1;
|
|
|
541 }
|
|
|
542
|
|
|
543 DEFUN ("decode-big5-char", Fdecode_big5_char, 1, 1, 0, /*
|
|
|
544 Convert Big Five character codes in CODE into a character.
|
|
|
545 CODE is a cons of two integers specifying the codepoints in Big Five.
|
|
|
546 Return the corresponding character, or nil if the codepoints are out of range.
|
|
|
547
|
|
|
548 The term `decode' is used because the codepoints can be viewed as the
|
|
|
549 representation of the character in the external Big Five encoding, and thus
|
|
|
550 converting them to a character is analogous to any other operation that
|
|
|
551 decodes an external representation.
|
|
|
552 */
|
|
|
553 (code))
|
|
|
554 {
|
|
867
|
555 Ichar ch;
|
|
771
|
556
|
|
|
557 CHECK_CONS (code);
|
|
|
558 CHECK_INT (XCAR (code));
|
|
|
559 CHECK_INT (XCDR (code));
|
|
|
560 ch = decode_big5_char (XINT (XCAR (code)), XINT (XCDR (code)));
|
|
|
561 if (ch == -1)
|
|
|
562 return Qnil;
|
|
|
563 else
|
|
|
564 return make_char (ch);
|
|
|
565 }
|
|
|
566
|
|
|
567 DEFUN ("encode-big5-char", Fencode_big5_char, 1, 1, 0, /*
|
|
|
568 Convert the specified Big Five character into its codepoints.
|
|
|
569 The codepoints are returned as a cons of two integers, specifying the
|
|
|
570 Big Five codepoints. See `decode-big5-char' for the reason why the
|
|
|
571 term `encode' is used for this operation.
|
|
|
572 */
|
|
|
573 (character))
|
|
|
574 {
|
|
|
575 Lisp_Object charset;
|
|
|
576 int c1, c2, b1, b2;
|
|
|
577
|
|
|
578 CHECK_CHAR_COERCE_INT (character);
|
|
867
|
579 BREAKUP_ICHAR (XCHAR (character), charset, c1, c2);
|
|
771
|
580 if (EQ (charset, Vcharset_chinese_big5_1) ||
|
|
|
581 EQ (charset, Vcharset_chinese_big5_2))
|
|
|
582 {
|
|
|
583 ENCODE_BIG5 (XCHARSET_LEADING_BYTE (charset), c1 | 0x80, c2 | 0x80,
|
|
|
584 b1, b2);
|
|
|
585 return Fcons (make_int (b1), make_int (b2));
|
|
|
586 }
|
|
|
587 else
|
|
|
588 return Qnil;
|
|
|
589 }
|
|
|
590
|
|
|
591
|
|
|
592 /************************************************************************/
|
|
|
593 /* Big5 detector */
|
|
|
594 /************************************************************************/
|
|
|
595
|
|
|
596 DEFINE_DETECTOR (big5);
|
|
|
597 DEFINE_DETECTOR_CATEGORY (big5, big5);
|
|
|
598
|
|
|
599 struct big5_detector
|
|
|
600 {
|
|
|
601 int seen_big5_char;
|
|
985
|
602 int seen_euc_char;
|
|
771
|
603 unsigned int seen_iso2022_esc:1;
|
|
|
604 unsigned int seen_bad_first_byte:1;
|
|
|
605 unsigned int seen_bad_second_byte:1;
|
|
|
606
|
|
|
607 /* temporary */
|
|
|
608 unsigned int in_second_byte:1;
|
|
|
609 };
|
|
|
610
|
|
|
611 static void
|
|
|
612 big5_detect (struct detection_state *st, const UExtbyte *src,
|
|
|
613 Bytecount n)
|
|
|
614 {
|
|
|
615 struct big5_detector *data = DETECTION_STATE_DATA (st, big5);
|
|
|
616
|
|
|
617 while (n--)
|
|
|
618 {
|
|
|
619 UExtbyte c = *src++;
|
|
|
620 if (!data->in_second_byte)
|
|
|
621 {
|
|
|
622 if (c >= 0xA1 && c <= 0xFE)
|
|
|
623 data->in_second_byte = 1;
|
|
|
624 else if (c == ISO_CODE_ESC || c == ISO_CODE_SI || c == ISO_CODE_SO)
|
|
|
625 data->seen_iso2022_esc = 1;
|
|
|
626 else if (c >= 0x80)
|
|
|
627 data->seen_bad_first_byte = 1;
|
|
|
628 }
|
|
|
629 else
|
|
|
630 {
|
|
|
631 data->in_second_byte = 0;
|
|
985
|
632 if (c >= 0xA1 && c <= 0xFE)
|
|
|
633 data->seen_euc_char++;
|
|
|
634 else if (c >= 0x40 && c <= 0x7E)
|
|
771
|
635 data->seen_big5_char++;
|
|
|
636 else
|
|
|
637 data->seen_bad_second_byte = 1;
|
|
|
638 }
|
|
|
639 }
|
|
|
640
|
|
|
641 if (data->seen_bad_second_byte)
|
|
|
642 DET_RESULT (st, big5) = DET_NEARLY_IMPOSSIBLE;
|
|
|
643 else if (data->seen_bad_first_byte)
|
|
|
644 DET_RESULT (st, big5) = DET_QUITE_IMPROBABLE;
|
|
|
645 else if (data->seen_iso2022_esc)
|
|
|
646 DET_RESULT (st, big5) = DET_SOMEWHAT_UNLIKELY;
|
|
|
647 else if (data->seen_big5_char >= 4)
|
|
|
648 DET_RESULT (st, big5) = DET_SOMEWHAT_LIKELY;
|
|
985
|
649 else if (data->seen_euc_char)
|
|
|
650 DET_RESULT (st, big5) = DET_SLIGHTLY_LIKELY;
|
|
771
|
651 else
|
|
|
652 DET_RESULT (st, big5) = DET_AS_LIKELY_AS_UNLIKELY;
|
|
|
653 }
|
|
|
654
|
|
|
655
|
|
|
656 /************************************************************************/
|
|
|
657 /* ISO2022 methods */
|
|
|
658 /************************************************************************/
|
|
|
659
|
|
|
660 /* Any ISO-2022-compliant coding system. Includes JIS, EUC, CTEXT
|
|
|
661 (Compound Text, the encoding of selections in X Windows). See below for
|
|
|
662 a complete description of ISO-2022. */
|
|
|
663 DEFINE_CODING_SYSTEM_TYPE (iso2022);
|
|
|
664
|
|
|
665 /* Flags indicating what we've seen so far when parsing an
|
|
|
666 ISO2022 escape sequence. */
|
|
|
667 enum iso_esc_flag
|
|
|
668 {
|
|
|
669 /* Partial sequences */
|
|
|
670 ISO_ESC_NOTHING, /* Nothing has been seen. */
|
|
|
671 ISO_ESC, /* We've seen ESC. */
|
|
|
672 ISO_ESC_2_4, /* We've seen ESC $. This indicates
|
|
|
673 that we're designating a multi-byte, rather
|
|
|
674 than a single-byte, character set. */
|
|
|
675 ISO_ESC_2_8, /* We've seen ESC 0x28, i.e. ESC (.
|
|
|
676 This means designate a 94-character
|
|
|
677 character set into G0. */
|
|
|
678 ISO_ESC_2_9, /* We've seen ESC 0x29 -- designate a
|
|
|
679 94-character character set into G1. */
|
|
|
680 ISO_ESC_2_10, /* We've seen ESC 0x2A. */
|
|
|
681 ISO_ESC_2_11, /* We've seen ESC 0x2B. */
|
|
|
682 ISO_ESC_2_12, /* We've seen ESC 0x2C -- designate a
|
|
|
683 96-character character set into G0.
|
|
|
684 (This is not ISO2022-standard.
|
|
|
685 The following 96-character
|
|
|
686 control sequences are standard,
|
|
|
687 though.) */
|
|
|
688 ISO_ESC_2_13, /* We've seen ESC 0x2D -- designate a
|
|
|
689 96-character character set into G1.
|
|
|
690 */
|
|
|
691 ISO_ESC_2_14, /* We've seen ESC 0x2E. */
|
|
|
692 ISO_ESC_2_15, /* We've seen ESC 0x2F. */
|
|
|
693 ISO_ESC_2_4_8, /* We've seen ESC $ 0x28 -- designate
|
|
|
694 a 94^N character set into G0. */
|
|
|
695 ISO_ESC_2_4_9, /* We've seen ESC $ 0x29. */
|
|
|
696 ISO_ESC_2_4_10, /* We've seen ESC $ 0x2A. */
|
|
|
697 ISO_ESC_2_4_11, /* We've seen ESC $ 0x2B. */
|
|
|
698 ISO_ESC_2_4_12, /* We've seen ESC $ 0x2C. */
|
|
|
699 ISO_ESC_2_4_13, /* We've seen ESC $ 0x2D. */
|
|
|
700 ISO_ESC_2_4_14, /* We've seen ESC $ 0x2E. */
|
|
|
701 ISO_ESC_2_4_15, /* We've seen ESC $ 0x2F. */
|
|
|
702 ISO_ESC_5_11, /* We've seen ESC [ or 0x9B. This
|
|
|
703 starts a directionality-control
|
|
|
704 sequence. The next character
|
|
|
705 must be 0, 1, 2, or ]. */
|
|
|
706 ISO_ESC_5_11_0, /* We've seen 0x9B 0. The next character must be ]. */
|
|
|
707 ISO_ESC_5_11_1, /* We've seen 0x9B 1. The next character must be ]. */
|
|
|
708 ISO_ESC_5_11_2, /* We've seen 0x9B 2. The next character must be ]. */
|
|
|
709
|
|
|
710 /* Full sequences. */
|
|
|
711 ISO_ESC_START_COMPOSITE, /* Private usage for START COMPOSING */
|
|
|
712 ISO_ESC_END_COMPOSITE, /* Private usage for END COMPOSING */
|
|
|
713 ISO_ESC_SINGLE_SHIFT, /* We've seen a complete single-shift sequence. */
|
|
|
714 ISO_ESC_LOCKING_SHIFT,/* We've seen a complete locking-shift sequence. */
|
|
|
715 ISO_ESC_DESIGNATE, /* We've seen a complete designation sequence. */
|
|
|
716 ISO_ESC_DIRECTIONALITY,/* We've seen a complete ISO6429 directionality
|
|
|
717 sequence. */
|
|
|
718 ISO_ESC_LITERAL /* We've seen a literal character ala
|
|
|
719 escape-quoting. */
|
|
|
720 };
|
|
|
721
|
|
|
722 enum iso_error
|
|
|
723 {
|
|
|
724 ISO_ERROR_BAD_FINAL,
|
|
|
725 ISO_ERROR_UNKWOWN_ESC_SEQUENCE,
|
|
|
726 ISO_ERROR_INVALID_CODE_POINT_CHARACTER,
|
|
|
727 };
|
|
|
728
|
|
|
729
|
|
|
730 /* Flags indicating current state while converting code. */
|
|
|
731
|
|
|
732 /************ Used during encoding and decoding: ************/
|
|
|
733 /* If set, the current directionality is right-to-left. Otherwise, it's
|
|
|
734 left-to-right. */
|
|
|
735 #define ISO_STATE_R2L (1 << 0)
|
|
|
736
|
|
|
737 /************ Used during encoding: ************/
|
|
|
738 /* If set, we just saw a CR. */
|
|
|
739 #define ISO_STATE_CR (1 << 1)
|
|
|
740
|
|
|
741 /************ Used during decoding: ************/
|
|
|
742 /* If set, we're currently parsing an escape sequence and the upper 16 bits
|
|
|
743 should be looked at to indicate what partial escape sequence we've seen
|
|
|
744 so far. Otherwise, we're running through actual text. */
|
|
|
745 #define ISO_STATE_ESCAPE (1 << 2)
|
|
|
746 /* If set, G2 is invoked into GL, but only for the next character. */
|
|
|
747 #define ISO_STATE_SS2 (1 << 3)
|
|
|
748 /* If set, G3 is invoked into GL, but only for the next character. If both
|
|
|
749 ISO_STATE_SS2 and ISO_STATE_SS3 are set, ISO_STATE_SS2 overrides; but
|
|
|
750 this probably indicates an error in the text encoding. */
|
|
|
751 #define ISO_STATE_SS3 (1 << 4)
|
|
|
752 /* If set, we're currently processing a composite character (i.e. a
|
|
|
753 character constructed by overstriking two or more characters). */
|
|
|
754 #define ISO_STATE_COMPOSITE (1 << 5)
|
|
|
755
|
|
|
756 /* ISO_STATE_LOCK is the mask of flags that remain on until explicitly
|
|
|
757 turned off when in the ISO2022 encoder/decoder. Other flags are turned
|
|
|
758 off at the end of processing each character or escape sequence. */
|
|
|
759 # define ISO_STATE_LOCK \
|
|
|
760 (ISO_STATE_COMPOSITE | ISO_STATE_R2L)
|
|
|
761
|
|
|
762 typedef struct charset_conversion_spec
|
|
|
763 {
|
|
|
764 Lisp_Object from_charset;
|
|
|
765 Lisp_Object to_charset;
|
|
|
766 } charset_conversion_spec;
|
|
|
767
|
|
|
768 typedef struct
|
|
|
769 {
|
|
|
770 Dynarr_declare (charset_conversion_spec);
|
|
|
771 } charset_conversion_spec_dynarr;
|
|
|
772
|
|
|
773 struct iso2022_coding_system
|
|
|
774 {
|
|
|
775 /* What are the charsets to be initially designated to G0, G1,
|
|
|
776 G2, G3? If t, no charset is initially designated. If nil,
|
|
|
777 no charset is initially designated and no charset is allowed
|
|
|
778 to be designated. */
|
|
|
779 Lisp_Object initial_charset[4];
|
|
|
780
|
|
|
781 /* If true, a designation escape sequence needs to be sent on output
|
|
|
782 for the charset in G[0-3] before that charset is used. */
|
|
|
783 unsigned char force_charset_on_output[4];
|
|
|
784
|
|
|
785 charset_conversion_spec_dynarr *input_conv;
|
|
|
786 charset_conversion_spec_dynarr *output_conv;
|
|
|
787
|
|
|
788 unsigned int shoort :1; /* C makes you speak Dutch */
|
|
|
789 unsigned int no_ascii_eol :1;
|
|
|
790 unsigned int no_ascii_cntl :1;
|
|
|
791 unsigned int seven :1;
|
|
|
792 unsigned int lock_shift :1;
|
|
|
793 unsigned int no_iso6429 :1;
|
|
|
794 unsigned int escape_quoted :1;
|
|
|
795 };
|
|
|
796
|
|
|
797 #define CODING_SYSTEM_ISO2022_INITIAL_CHARSET(codesys, g) \
|
|
|
798 (CODING_SYSTEM_TYPE_DATA (codesys, iso2022)->initial_charset[g])
|
|
|
799 #define CODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT(codesys, g) \
|
|
|
800 (CODING_SYSTEM_TYPE_DATA (codesys, iso2022)->force_charset_on_output[g])
|
|
|
801 #define CODING_SYSTEM_ISO2022_SHORT(codesys) \
|
|
|
802 (CODING_SYSTEM_TYPE_DATA (codesys, iso2022)->shoort)
|
|
|
803 #define CODING_SYSTEM_ISO2022_NO_ASCII_EOL(codesys) \
|
|
|
804 (CODING_SYSTEM_TYPE_DATA (codesys, iso2022)->no_ascii_eol)
|
|
|
805 #define CODING_SYSTEM_ISO2022_NO_ASCII_CNTL(codesys) \
|
|
|
806 (CODING_SYSTEM_TYPE_DATA (codesys, iso2022)->no_ascii_cntl)
|
|
|
807 #define CODING_SYSTEM_ISO2022_SEVEN(codesys) \
|
|
|
808 (CODING_SYSTEM_TYPE_DATA (codesys, iso2022)->seven)
|
|
|
809 #define CODING_SYSTEM_ISO2022_LOCK_SHIFT(codesys) \
|
|
|
810 (CODING_SYSTEM_TYPE_DATA (codesys, iso2022)->lock_shift)
|
|
|
811 #define CODING_SYSTEM_ISO2022_NO_ISO6429(codesys) \
|
|
|
812 (CODING_SYSTEM_TYPE_DATA (codesys, iso2022)->no_iso6429)
|
|
|
813 #define CODING_SYSTEM_ISO2022_ESCAPE_QUOTED(codesys) \
|
|
|
814 (CODING_SYSTEM_TYPE_DATA (codesys, iso2022)->escape_quoted)
|
|
|
815 #define CODING_SYSTEM_ISO2022_INPUT_CONV(codesys) \
|
|
|
816 (CODING_SYSTEM_TYPE_DATA (codesys, iso2022)->input_conv)
|
|
|
817 #define CODING_SYSTEM_ISO2022_OUTPUT_CONV(codesys) \
|
|
|
818 (CODING_SYSTEM_TYPE_DATA (codesys, iso2022)->output_conv)
|
|
|
819
|
|
|
820 #define XCODING_SYSTEM_ISO2022_INITIAL_CHARSET(codesys, g) \
|
|
|
821 CODING_SYSTEM_ISO2022_INITIAL_CHARSET (XCODING_SYSTEM (codesys), g)
|
|
|
822 #define XCODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT(codesys, g) \
|
|
|
823 CODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT (XCODING_SYSTEM (codesys), g)
|
|
|
824 #define XCODING_SYSTEM_ISO2022_SHORT(codesys) \
|
|
|
825 CODING_SYSTEM_ISO2022_SHORT (XCODING_SYSTEM (codesys))
|
|
|
826 #define XCODING_SYSTEM_ISO2022_NO_ASCII_EOL(codesys) \
|
|
|
827 CODING_SYSTEM_ISO2022_NO_ASCII_EOL (XCODING_SYSTEM (codesys))
|
|
|
828 #define XCODING_SYSTEM_ISO2022_NO_ASCII_CNTL(codesys) \
|
|
|
829 CODING_SYSTEM_ISO2022_NO_ASCII_CNTL (XCODING_SYSTEM (codesys))
|
|
|
830 #define XCODING_SYSTEM_ISO2022_SEVEN(codesys) \
|
|
|
831 CODING_SYSTEM_ISO2022_SEVEN (XCODING_SYSTEM (codesys))
|
|
|
832 #define XCODING_SYSTEM_ISO2022_LOCK_SHIFT(codesys) \
|
|
|
833 CODING_SYSTEM_ISO2022_LOCK_SHIFT (XCODING_SYSTEM (codesys))
|
|
|
834 #define XCODING_SYSTEM_ISO2022_NO_ISO6429(codesys) \
|
|
|
835 CODING_SYSTEM_ISO2022_NO_ISO6429 (XCODING_SYSTEM (codesys))
|
|
|
836 #define XCODING_SYSTEM_ISO2022_ESCAPE_QUOTED(codesys) \
|
|
|
837 CODING_SYSTEM_ISO2022_ESCAPE_QUOTED (XCODING_SYSTEM (codesys))
|
|
|
838 #define XCODING_SYSTEM_ISO2022_INPUT_CONV(codesys) \
|
|
|
839 CODING_SYSTEM_ISO2022_INPUT_CONV (XCODING_SYSTEM (codesys))
|
|
|
840 #define XCODING_SYSTEM_ISO2022_OUTPUT_CONV(codesys) \
|
|
|
841 CODING_SYSTEM_ISO2022_OUTPUT_CONV (XCODING_SYSTEM (codesys))
|
|
|
842
|
|
|
843 /* Additional information used by the ISO2022 decoder and detector. */
|
|
|
844 struct iso2022_coding_stream
|
|
|
845 {
|
|
|
846 /* CHARSET holds the character sets currently assigned to the G0
|
|
|
847 through G3 variables. It is initialized from the array
|
|
|
848 INITIAL_CHARSET in CODESYS. */
|
|
|
849 Lisp_Object charset[4];
|
|
|
850
|
|
|
851 /* Which registers are currently invoked into the left (GL) and
|
|
|
852 right (GR) halves of the 8-bit encoding space? */
|
|
|
853 int register_left, register_right;
|
|
|
854
|
|
|
855 /* FLAGS holds flags indicating the current state of the encoding. Some of
|
|
|
856 these flags are actually part of the state-dependent data and should be
|
|
|
857 moved there. */
|
|
|
858 unsigned int flags;
|
|
|
859
|
|
|
860 /**************** for decoding ****************/
|
|
|
861
|
|
|
862 /* ISO_ESC holds a value indicating part of an escape sequence
|
|
|
863 that has already been seen. */
|
|
|
864 enum iso_esc_flag esc;
|
|
|
865
|
|
|
866 /* This records the bytes we've seen so far in an escape sequence,
|
|
|
867 in case the sequence is invalid (we spit out the bytes unchanged). */
|
|
|
868 unsigned char esc_bytes[8];
|
|
|
869
|
|
|
870 /* Index for next byte to store in ISO escape sequence. */
|
|
|
871 int esc_bytes_index;
|
|
|
872
|
|
|
873 #ifdef ENABLE_COMPOSITE_CHARS
|
|
|
874 /* Stuff seen so far when composing a string. */
|
|
|
875 unsigned_char_dynarr *composite_chars;
|
|
|
876 #endif
|
|
|
877
|
|
|
878 /* If we saw an invalid designation sequence for a particular
|
|
|
879 register, we flag it here and switch to ASCII. The next time we
|
|
|
880 see a valid designation for this register, we turn off the flag
|
|
|
881 and do the designation normally, but pretend the sequence was
|
|
|
882 invalid. The effect of all this is that (most of the time) the
|
|
|
883 escape sequences for both the switch to the unknown charset, and
|
|
|
884 the switch back to the known charset, get inserted literally into
|
|
|
885 the buffer and saved out as such. The hope is that we can
|
|
|
886 preserve the escape sequences so that the resulting written out
|
|
|
887 file makes sense. If we don't do any of this, the designation
|
|
|
888 to the invalid charset will be preserved but that switch back
|
|
|
889 to the known charset will probably get eaten because it was
|
|
|
890 the same charset that was already present in the register. */
|
|
|
891 unsigned char invalid_designated[4];
|
|
|
892
|
|
|
893 /* We try to do similar things as above for direction-switching
|
|
|
894 sequences. If we encountered a direction switch while an
|
|
|
895 invalid designation was present, or an invalid designation
|
|
|
896 just after a direction switch (i.e. no valid designation
|
|
|
897 encountered yet), we insert the direction-switch escape
|
|
|
898 sequence literally into the output stream, and later on
|
|
|
899 insert the corresponding direction-restoring escape sequence
|
|
|
900 literally also. */
|
|
|
901 unsigned int switched_dir_and_no_valid_charset_yet :1;
|
|
|
902 unsigned int invalid_switch_dir :1;
|
|
|
903
|
|
|
904 /* Tells the decoder to output the escape sequence literally
|
|
|
905 even though it was valid. Used in the games we play to
|
|
|
906 avoid lossage when we encounter invalid designations. */
|
|
|
907 unsigned int output_literally :1;
|
|
|
908 /* We encountered a direction switch followed by an invalid
|
|
|
909 designation. We didn't output the direction switch
|
|
|
910 literally because we didn't know about the invalid designation;
|
|
|
911 but we have to do so now. */
|
|
|
912 unsigned int output_direction_sequence :1;
|
|
|
913
|
|
|
914 /**************** for encoding ****************/
|
|
|
915
|
|
|
916 /* Whether we need to explicitly designate the charset in the
|
|
|
917 G? register before using it. It is initialized from the
|
|
|
918 array FORCE_CHARSET_ON_OUTPUT in CODESYS. */
|
|
|
919 unsigned char force_charset_on_output[4];
|
|
|
920
|
|
|
921 /* Other state variables that need to be preserved across
|
|
|
922 invocations. */
|
|
|
923 Lisp_Object current_charset;
|
|
|
924 int current_half;
|
|
|
925 int current_char_boundary;
|
|
|
926 };
|
|
|
927
|
|
|
928 static const struct lrecord_description ccs_description_1[] =
|
|
|
929 {
|
|
|
930 { XD_LISP_OBJECT, offsetof (charset_conversion_spec, from_charset) },
|
|
|
931 { XD_LISP_OBJECT, offsetof (charset_conversion_spec, to_charset) },
|
|
|
932 { XD_END }
|
|
|
933 };
|
|
|
934
|
|
|
935 static const struct struct_description ccs_description =
|
|
|
936 {
|
|
|
937 sizeof (charset_conversion_spec),
|
|
|
938 ccs_description_1
|
|
|
939 };
|
|
|
940
|
|
|
941 static const struct lrecord_description ccsd_description_1[] =
|
|
|
942 {
|
|
|
943 XD_DYNARR_DESC (charset_conversion_spec_dynarr, &ccs_description),
|
|
|
944 { XD_END }
|
|
|
945 };
|
|
|
946
|
|
|
947 static const struct struct_description ccsd_description =
|
|
|
948 {
|
|
|
949 sizeof (charset_conversion_spec_dynarr),
|
|
|
950 ccsd_description_1
|
|
|
951 };
|
|
|
952
|
|
|
953 static const struct lrecord_description iso2022_coding_system_description[] = {
|
|
|
954 { XD_LISP_OBJECT_ARRAY,
|
|
|
955 coding_system_data_offset + offsetof (struct iso2022_coding_system,
|
|
|
956 initial_charset), 4 },
|
|
|
957 { XD_STRUCT_PTR,
|
|
|
958 coding_system_data_offset + offsetof (struct iso2022_coding_system,
|
|
|
959 input_conv),
|
|
|
960 1, &ccsd_description },
|
|
|
961 { XD_STRUCT_PTR,
|
|
|
962 coding_system_data_offset + offsetof (struct iso2022_coding_system,
|
|
|
963 output_conv),
|
|
|
964 1, &ccsd_description },
|
|
|
965 { XD_END }
|
|
|
966 };
|
|
|
967
|
|
|
968 /* The following note taken directly from FSF 21.0.103. */
|
|
|
969
|
|
|
970 /* The following note describes the coding system ISO2022 briefly.
|
|
|
971 Since the intention of this note is to help understand the
|
|
|
972 functions in this file, some parts are NOT ACCURATE or are OVERLY
|
|
|
973 SIMPLIFIED. For thorough understanding, please refer to the
|
|
|
974 original document of ISO2022. This is equivalent to the standard
|
|
|
975 ECMA-35, obtainable from <URL:http://www.ecma.ch/> (*).
|
|
|
976
|
|
|
977 ISO2022 provides many mechanisms to encode several character sets
|
|
|
978 in 7-bit and 8-bit environments. For 7-bit environments, all text
|
|
|
979 is encoded using bytes less than 128. This may make the encoded
|
|
|
980 text a little bit longer, but the text passes more easily through
|
|
|
981 several types of gateway, some of which strip off the MSB (Most
|
|
|
982 Significant Bit).
|
|
|
983
|
|
|
984 There are two kinds of character sets: control character sets and
|
|
|
985 graphic character sets. The former contain control characters such
|
|
|
986 as `newline' and `escape' to provide control functions (control
|
|
|
987 functions are also provided by escape sequences). The latter
|
|
|
988 contain graphic characters such as 'A' and '-'. Emacs recognizes
|
|
|
989 two control character sets and many graphic character sets.
|
|
|
990
|
|
|
991 Graphic character sets are classified into one of the following
|
|
|
992 four classes, according to the number of bytes (DIMENSION) and
|
|
|
993 number of characters in one dimension (CHARS) of the set:
|
|
|
994 - DIMENSION1_CHARS94
|
|
|
995 - DIMENSION1_CHARS96
|
|
|
996 - DIMENSION2_CHARS94
|
|
|
997 - DIMENSION2_CHARS96
|
|
|
998
|
|
|
999 In addition, each character set is assigned an identification tag,
|
|
|
1000 unique for each set, called the "final character" (denoted as <F>
|
|
|
1001 hereafter). The <F> of each character set is decided by ECMA(*)
|
|
|
1002 when it is registered in ISO. The code range of <F> is 0x30..0x7F
|
|
|
1003 (0x30..0x3F are for private use only).
|
|
|
1004
|
|
|
1005 Note (*): ECMA = European Computer Manufacturers Association
|
|
|
1006
|
|
|
1007 Here are examples of graphic character sets [NAME(<F>)]:
|
|
|
1008 o DIMENSION1_CHARS94 -- ASCII('B'), right-half-of-JISX0201('I'), ...
|
|
|
1009 o DIMENSION1_CHARS96 -- right-half-of-ISO8859-1('A'), ...
|
|
|
1010 o DIMENSION2_CHARS94 -- GB2312('A'), JISX0208('B'), ...
|
|
|
1011 o DIMENSION2_CHARS96 -- none for the moment
|
|
|
1012
|
|
|
1013 A code area (1 byte=8 bits) is divided into 4 areas, C0, GL, C1, and GR.
|
|
|
1014 C0 [0x00..0x1F] -- control character plane 0
|
|
|
1015 GL [0x20..0x7F] -- graphic character plane 0
|
|
|
1016 C1 [0x80..0x9F] -- control character plane 1
|
|
|
1017 GR [0xA0..0xFF] -- graphic character plane 1
|
|
|
1018
|
|
|
1019 A control character set is directly designated and invoked to C0 or
|
|
|
1020 C1 by an escape sequence. The most common case is that:
|
|
|
1021 - ISO646's control character set is designated/invoked to C0, and
|
|
|
1022 - ISO6429's control character set is designated/invoked to C1,
|
|
|
1023 and usually these designations/invocations are omitted in encoded
|
|
|
1024 text. In a 7-bit environment, only C0 can be used, and a control
|
|
|
1025 character for C1 is encoded by an appropriate escape sequence to
|
|
|
1026 fit into the environment. All control characters for C1 are
|
|
|
1027 defined to have corresponding escape sequences.
|
|
|
1028
|
|
|
1029 A graphic character set is at first designated to one of four
|
|
|
1030 graphic registers (G0 through G3), then these graphic registers are
|
|
|
1031 invoked to GL or GR. These designations and invocations can be
|
|
|
1032 done independently. The most common case is that G0 is invoked to
|
|
|
1033 GL, G1 is invoked to GR, and ASCII is designated to G0. Usually
|
|
|
1034 these invocations and designations are omitted in encoded text.
|
|
|
1035 In a 7-bit environment, only GL can be used.
|
|
|
1036
|
|
|
1037 When a graphic character set of CHARS94 is invoked to GL, codes
|
|
|
1038 0x20 and 0x7F of the GL area work as control characters SPACE and
|
|
|
1039 DEL respectively, and codes 0xA0 and 0xFF of the GR area should not
|
|
|
1040 be used.
|
|
|
1041
|
|
|
1042 There are two ways of invocation: locking-shift and single-shift.
|
|
|
1043 With locking-shift, the invocation lasts until the next different
|
|
|
1044 invocation, whereas with single-shift, the invocation affects the
|
|
|
1045 following character only and doesn't affect the locking-shift
|
|
|
1046 state. Invocations are done by the following control characters or
|
|
|
1047 escape sequences:
|
|
|
1048
|
|
|
1049 ----------------------------------------------------------------------
|
|
|
1050 abbrev function cntrl escape seq description
|
|
|
1051 ----------------------------------------------------------------------
|
|
|
1052 SI/LS0 (shift-in) 0x0F none invoke G0 into GL
|
|
|
1053 SO/LS1 (shift-out) 0x0E none invoke G1 into GL
|
|
|
1054 LS2 (locking-shift-2) none ESC 'n' invoke G2 into GL
|
|
|
1055 LS3 (locking-shift-3) none ESC 'o' invoke G3 into GL
|
|
|
1056 LS1R (locking-shift-1 right) none ESC '~' invoke G1 into GR (*)
|
|
|
1057 LS2R (locking-shift-2 right) none ESC '}' invoke G2 into GR (*)
|
|
|
1058 LS3R (locking-shift 3 right) none ESC '|' invoke G3 into GR (*)
|
|
|
1059 SS2 (single-shift-2) 0x8E ESC 'N' invoke G2 for one char
|
|
|
1060 SS3 (single-shift-3) 0x8F ESC 'O' invoke G3 for one char
|
|
|
1061 ----------------------------------------------------------------------
|
|
|
1062 (*) These are not used by any known coding system.
|
|
|
1063
|
|
|
1064 Control characters for these functions are defined by macros
|
|
|
1065 ISO_CODE_XXX in `coding.h'.
|
|
|
1066
|
|
|
1067 Designations are done by the following escape sequences:
|
|
|
1068 ----------------------------------------------------------------------
|
|
|
1069 escape sequence description
|
|
|
1070 ----------------------------------------------------------------------
|
|
|
1071 ESC '(' <F> designate DIMENSION1_CHARS94<F> to G0
|
|
|
1072 ESC ')' <F> designate DIMENSION1_CHARS94<F> to G1
|
|
|
1073 ESC '*' <F> designate DIMENSION1_CHARS94<F> to G2
|
|
|
1074 ESC '+' <F> designate DIMENSION1_CHARS94<F> to G3
|
|
|
1075 ESC ',' <F> designate DIMENSION1_CHARS96<F> to G0 (*)
|
|
|
1076 ESC '-' <F> designate DIMENSION1_CHARS96<F> to G1
|
|
|
1077 ESC '.' <F> designate DIMENSION1_CHARS96<F> to G2
|
|
|
1078 ESC '/' <F> designate DIMENSION1_CHARS96<F> to G3
|
|
|
1079 ESC '$' '(' <F> designate DIMENSION2_CHARS94<F> to G0 (**)
|
|
|
1080 ESC '$' ')' <F> designate DIMENSION2_CHARS94<F> to G1
|
|
|
1081 ESC '$' '*' <F> designate DIMENSION2_CHARS94<F> to G2
|
|
|
1082 ESC '$' '+' <F> designate DIMENSION2_CHARS94<F> to G3
|
|
|
1083 ESC '$' ',' <F> designate DIMENSION2_CHARS96<F> to G0 (*)
|
|
|
1084 ESC '$' '-' <F> designate DIMENSION2_CHARS96<F> to G1
|
|
|
1085 ESC '$' '.' <F> designate DIMENSION2_CHARS96<F> to G2
|
|
|
1086 ESC '$' '/' <F> designate DIMENSION2_CHARS96<F> to G3
|
|
|
1087 ----------------------------------------------------------------------
|
|
|
1088
|
|
|
1089 In this list, "DIMENSION1_CHARS94<F>" means a graphic character set
|
|
|
1090 of dimension 1, chars 94, and final character <F>, etc...
|
|
|
1091
|
|
|
1092 Note (*): Although these designations are not allowed in ISO2022,
|
|
|
1093 Emacs accepts them on decoding, and produces them on encoding
|
|
|
1094 CHARS96 character sets in a coding system which is characterized as
|
|
|
1095 7-bit environment, non-locking-shift, and non-single-shift.
|
|
|
1096
|
|
|
1097 Note (**): If <F> is '@', 'A', or 'B', the intermediate character
|
|
|
1098 '(' can be omitted. We refer to this as "short-form" hereafter.
|
|
|
1099
|
|
|
1100 Now you may notice that there are a lot of ways of encoding the
|
|
|
1101 same multilingual text in ISO2022. Actually, there exist many
|
|
|
1102 coding systems such as Compound Text (used in X11's inter client
|
|
|
1103 communication, ISO-2022-JP (used in Japanese Internet), ISO-2022-KR
|
|
|
1104 (used in Korean Internet), EUC (Extended UNIX Code, used in Asian
|
|
|
1105 localized platforms), and all of these are variants of ISO2022.
|
|
|
1106
|
|
|
1107 In addition to the above, Emacs handles two more kinds of escape
|
|
|
1108 sequences: ISO6429's direction specification and Emacs' private
|
|
|
1109 sequence for specifying character composition.
|
|
|
1110
|
|
|
1111 ISO6429's direction specification takes the following form:
|
|
|
1112 o CSI ']' -- end of the current direction
|
|
|
1113 o CSI '0' ']' -- end of the current direction
|
|
|
1114 o CSI '1' ']' -- start of left-to-right text
|
|
|
1115 o CSI '2' ']' -- start of right-to-left text
|
|
|
1116 The control character CSI (0x9B: control sequence introducer) is
|
|
|
1117 abbreviated to the escape sequence ESC '[' in a 7-bit environment.
|
|
|
1118
|
|
|
1119 Character composition specification takes the following form:
|
|
|
1120 o ESC '0' -- start relative composition
|
|
|
1121 o ESC '1' -- end composition
|
|
|
1122 o ESC '2' -- start rule-base composition (*)
|
|
|
1123 o ESC '3' -- start relative composition with alternate chars (**)
|
|
|
1124 o ESC '4' -- start rule-base composition with alternate chars (**)
|
|
|
1125 Since these are not standard escape sequences of any ISO standard,
|
|
|
1126 the use of them with these meanings is restricted to Emacs only.
|
|
|
1127
|
|
|
1128 (*) This form is used only in Emacs 20.5 and older versions,
|
|
|
1129 but the newer versions can safely decode it.
|
|
|
1130 (**) This form is used only in Emacs 21.1 and newer versions,
|
|
|
1131 and the older versions can't decode it.
|
|
|
1132
|
|
|
1133 Here's a list of example usages of these composition escape
|
|
|
1134 sequences (categorized by `enum composition_method').
|
|
|
1135
|
|
|
1136 COMPOSITION_RELATIVE:
|
|
|
1137 ESC 0 CHAR [ CHAR ] ESC 1
|
|
|
1138 COMPOSITION_WITH_RULE:
|
|
|
1139 ESC 2 CHAR [ RULE CHAR ] ESC 1
|
|
|
1140 COMPOSITION_WITH_ALTCHARS:
|
|
|
1141 ESC 3 ALTCHAR [ ALTCHAR ] ESC 0 CHAR [ CHAR ] ESC 1
|
|
|
1142 COMPOSITION_WITH_RULE_ALTCHARS:
|
|
|
1143 ESC 4 ALTCHAR [ RULE ALTCHAR ] ESC 0 CHAR [ CHAR ] ESC 1 */
|
|
|
1144
|
|
|
1145 static void
|
|
|
1146 reset_iso2022_decode (Lisp_Object coding_system,
|
|
|
1147 struct iso2022_coding_stream *data)
|
|
|
1148 {
|
|
|
1149 int i;
|
|
|
1150 #ifdef ENABLE_COMPOSITE_CHARS
|
|
|
1151 unsigned_char_dynarr *old_composite_chars = data->composite_chars;
|
|
|
1152 #endif
|
|
|
1153
|
|
|
1154 xzero (*data);
|
|
|
1155
|
|
|
1156 for (i = 0; i < 4; i++)
|
|
|
1157 {
|
|
|
1158 if (!NILP (coding_system))
|
|
|
1159 data->charset[i] =
|
|
|
1160 XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (coding_system, i);
|
|
|
1161 else
|
|
|
1162 data->charset[i] = Qt;
|
|
|
1163 }
|
|
|
1164 data->esc = ISO_ESC_NOTHING;
|
|
|
1165 data->register_right = 1;
|
|
|
1166 #ifdef ENABLE_COMPOSITE_CHARS
|
|
|
1167 if (old_composite_chars)
|
|
|
1168 {
|
|
|
1169 data->composite_chars = old_composite_chars;
|
|
|
1170 Dynarr_reset (data->composite_chars);
|
|
|
1171 }
|
|
|
1172 #endif
|
|
|
1173 }
|
|
|
1174
|
|
|
1175 static void
|
|
|
1176 reset_iso2022_encode (Lisp_Object coding_system,
|
|
|
1177 struct iso2022_coding_stream *data)
|
|
|
1178 {
|
|
|
1179 int i;
|
|
|
1180
|
|
|
1181 xzero (*data);
|
|
|
1182
|
|
|
1183 for (i = 0; i < 4; i++)
|
|
|
1184 {
|
|
|
1185 data->charset[i] =
|
|
|
1186 XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (coding_system, i);
|
|
|
1187 data->force_charset_on_output[i] =
|
|
|
1188 XCODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT (coding_system, i);
|
|
|
1189 }
|
|
|
1190 data->register_right = 1;
|
|
|
1191 data->current_charset = Qnil;
|
|
|
1192 data->current_char_boundary = 1;
|
|
|
1193 }
|
|
|
1194
|
|
|
1195 static void
|
|
|
1196 iso2022_init_coding_stream (struct coding_stream *str)
|
|
|
1197 {
|
|
|
1198 if (str->direction == CODING_DECODE)
|
|
|
1199 reset_iso2022_decode (str->codesys,
|
|
|
1200 CODING_STREAM_TYPE_DATA (str, iso2022));
|
|
|
1201 else
|
|
|
1202 reset_iso2022_encode (str->codesys,
|
|
|
1203 CODING_STREAM_TYPE_DATA (str, iso2022));
|
|
|
1204 }
|
|
|
1205
|
|
|
1206 static void
|
|
|
1207 iso2022_rewind_coding_stream (struct coding_stream *str)
|
|
|
1208 {
|
|
|
1209 iso2022_init_coding_stream (str);
|
|
|
1210 }
|
|
|
1211
|
|
|
1212 static int
|
|
|
1213 fit_to_be_escape_quoted (unsigned char c)
|
|
|
1214 {
|
|
|
1215 switch (c)
|
|
|
1216 {
|
|
|
1217 case ISO_CODE_ESC:
|
|
|
1218 case ISO_CODE_CSI:
|
|
|
1219 case ISO_CODE_SS2:
|
|
|
1220 case ISO_CODE_SS3:
|
|
|
1221 case ISO_CODE_SO:
|
|
|
1222 case ISO_CODE_SI:
|
|
|
1223 return 1;
|
|
|
1224
|
|
|
1225 default:
|
|
|
1226 return 0;
|
|
|
1227 }
|
|
|
1228 }
|
|
|
1229
|
|
|
1230 static Lisp_Object
|
|
867
|
1231 charset_by_attributes_or_create_one (int type, Ibyte final, int dir)
|
|
771
|
1232 {
|
|
826
|
1233 Lisp_Object charset = charset_by_attributes (type, final, dir);
|
|
771
|
1234
|
|
|
1235 if (NILP (charset))
|
|
|
1236 {
|
|
|
1237 int chars, dim;
|
|
|
1238
|
|
|
1239 switch (type)
|
|
|
1240 {
|
|
|
1241 case CHARSET_TYPE_94:
|
|
|
1242 chars = 94; dim = 1;
|
|
|
1243 break;
|
|
|
1244 case CHARSET_TYPE_96:
|
|
|
1245 chars = 96; dim = 1;
|
|
|
1246 break;
|
|
|
1247 case CHARSET_TYPE_94X94:
|
|
|
1248 chars = 94; dim = 2;
|
|
|
1249 break;
|
|
|
1250 case CHARSET_TYPE_96X96:
|
|
|
1251 chars = 96; dim = 2;
|
|
|
1252 break;
|
|
|
1253 default:
|
|
|
1254 abort (); chars = 0; dim = 0;
|
|
|
1255 }
|
|
|
1256
|
|
|
1257 charset = Fmake_charset (Qunbound, Qnil,
|
|
|
1258 nconc2 (list6 (Qfinal, make_char (final),
|
|
|
1259 Qchars, make_int (chars),
|
|
|
1260 Qdimension, make_int (dim)),
|
|
|
1261 list2 (Qdirection,
|
|
|
1262 dir == CHARSET_LEFT_TO_RIGHT ?
|
|
|
1263 Ql2r : Qr2l)));
|
|
|
1264 }
|
|
|
1265
|
|
|
1266 return charset;
|
|
|
1267 }
|
|
|
1268
|
|
|
1269 /* Parse one byte of an ISO2022 escape sequence.
|
|
|
1270 If the result is an invalid escape sequence, return 0 and
|
|
|
1271 do not change anything in STR. Otherwise, if the result is
|
|
|
1272 an incomplete escape sequence, update ISO2022.ESC and
|
|
|
1273 ISO2022.ESC_BYTES and return -1. Otherwise, update
|
|
|
1274 all the state variables (but not ISO2022.ESC_BYTES) and
|
|
|
1275 return 1.
|
|
|
1276
|
|
|
1277 If CHECK_INVALID_CHARSETS is non-zero, check for designation
|
|
|
1278 or invocation of an invalid character set and treat that as
|
|
|
1279 an unrecognized escape sequence.
|
|
|
1280
|
|
|
1281 ********************************************************************
|
|
|
1282
|
|
|
1283 #### Strategies for error annotation and coding orthogonalization
|
|
|
1284
|
|
|
1285 We really want to separate out a number of things. Conceptually,
|
|
|
1286 there is a nested syntax.
|
|
|
1287
|
|
|
1288 At the top level is the ISO 2022 extension syntax, including charset
|
|
|
1289 designation and invocation, and certain auxiliary controls such as the
|
|
|
1290 ISO 6429 direction specification. These are octet-oriented, with the
|
|
|
1291 single exception (AFAIK) of the "exit Unicode" sequence which uses the
|
|
|
1292 UTF's natural width (1 byte for UTF-7 and UTF-8, 2 bytes for UCS-2 and
|
|
|
1293 UTF-16, and 4 bytes for UCS-4 and UTF-32). This will be treated as a
|
|
|
1294 (deprecated) special case in Unicode processing.
|
|
|
1295
|
|
|
1296 The middle layer is ISO 2022 character interpretation. This will depend
|
|
|
1297 on the current state of the ISO 2022 registers, and assembles octets
|
|
|
1298 into the character's internal representation.
|
|
|
1299
|
|
|
1300 The lowest level is translating system control conventions. At present
|
|
|
1301 this is restricted to newline translation, but one could imagine doing
|
|
|
1302 tab conversion or line wrapping here. "Escape from Unicode" processing
|
|
|
1303 would be done at this level.
|
|
|
1304
|
|
|
1305 At each level the parser will verify the syntax. In the case of a
|
|
|
1306 syntax error or warning (such as a redundant escape sequence that affects
|
|
|
1307 no characters), the parser will take some action, typically inserting the
|
|
|
1308 erroneous octets directly into the output and creating an annotation
|
|
|
1309 which can be used by higher level I/O to mark the affected region.
|
|
|
1310
|
|
|
1311 This should make it possible to do something sensible about separating
|
|
|
1312 newline convention processing from character construction, and about
|
|
|
1313 preventing ISO 2022 escape sequences from being recognized
|
|
|
1314 inappropriately.
|
|
|
1315
|
|
|
1316 The basic strategy will be to have octet classification tables, and
|
|
|
1317 switch processing according to the table entry.
|
|
|
1318
|
|
|
1319 It's possible that, by doing the processing with tables of functions or
|
|
|
1320 the like, the parser can be used for both detection and translation. */
|
|
|
1321
|
|
|
1322 static int
|
|
|
1323 parse_iso2022_esc (Lisp_Object codesys, struct iso2022_coding_stream *iso,
|
|
|
1324 unsigned char c, unsigned int *flags,
|
|
|
1325 int check_invalid_charsets)
|
|
|
1326 {
|
|
|
1327 /* (1) If we're at the end of a designation sequence, CS is the
|
|
|
1328 charset being designated and REG is the register to designate
|
|
|
1329 it to.
|
|
|
1330
|
|
|
1331 (2) If we're at the end of a locking-shift sequence, REG is
|
|
|
1332 the register to invoke and HALF (0 == left, 1 == right) is
|
|
|
1333 the half to invoke it into.
|
|
|
1334
|
|
|
1335 (3) If we're at the end of a single-shift sequence, REG is
|
|
|
1336 the register to invoke. */
|
|
|
1337 Lisp_Object cs = Qnil;
|
|
|
1338 int reg, half;
|
|
|
1339
|
|
|
1340 /* NOTE: This code does goto's all over the fucking place.
|
|
|
1341 The reason for this is that we're basically implementing
|
|
|
1342 a state machine here, and hierarchical languages like C
|
|
|
1343 don't really provide a clean way of doing this. */
|
|
|
1344
|
|
|
1345 if (! (*flags & ISO_STATE_ESCAPE))
|
|
|
1346 /* At beginning of escape sequence; we need to reset our
|
|
|
1347 escape-state variables. */
|
|
|
1348 iso->esc = ISO_ESC_NOTHING;
|
|
|
1349
|
|
|
1350 iso->output_literally = 0;
|
|
|
1351 iso->output_direction_sequence = 0;
|
|
|
1352
|
|
|
1353 switch (iso->esc)
|
|
|
1354 {
|
|
|
1355 case ISO_ESC_NOTHING:
|
|
|
1356 iso->esc_bytes_index = 0;
|
|
|
1357 switch (c)
|
|
|
1358 {
|
|
|
1359 case ISO_CODE_ESC: /* Start escape sequence */
|
|
|
1360 *flags |= ISO_STATE_ESCAPE;
|
|
|
1361 iso->esc = ISO_ESC;
|
|
|
1362 goto not_done;
|
|
|
1363
|
|
|
1364 case ISO_CODE_CSI: /* ISO6429 (specifying directionality) */
|
|
|
1365 *flags |= ISO_STATE_ESCAPE;
|
|
|
1366 iso->esc = ISO_ESC_5_11;
|
|
|
1367 goto not_done;
|
|
|
1368
|
|
|
1369 case ISO_CODE_SO: /* locking shift 1 */
|
|
|
1370 reg = 1; half = 0;
|
|
|
1371 goto locking_shift;
|
|
|
1372 case ISO_CODE_SI: /* locking shift 0 */
|
|
|
1373 reg = 0; half = 0;
|
|
|
1374 goto locking_shift;
|
|
|
1375
|
|
|
1376 case ISO_CODE_SS2: /* single shift */
|
|
|
1377 reg = 2;
|
|
|
1378 goto single_shift;
|
|
|
1379 case ISO_CODE_SS3: /* single shift */
|
|
|
1380 reg = 3;
|
|
|
1381 goto single_shift;
|
|
|
1382
|
|
|
1383 default: /* Other control characters */
|
|
|
1384 error:
|
|
|
1385 *flags &= ISO_STATE_LOCK;
|
|
|
1386 return 0;
|
|
|
1387 }
|
|
|
1388
|
|
|
1389 case ISO_ESC:
|
|
|
1390 switch (c)
|
|
|
1391 {
|
|
|
1392 /**** single shift ****/
|
|
|
1393
|
|
|
1394 case 'N': /* single shift 2 */
|
|
|
1395 reg = 2;
|
|
|
1396 goto single_shift;
|
|
|
1397 case 'O': /* single shift 3 */
|
|
|
1398 reg = 3;
|
|
|
1399 goto single_shift;
|
|
|
1400
|
|
|
1401 /**** locking shift ****/
|
|
|
1402
|
|
|
1403 case '~': /* locking shift 1 right */
|
|
|
1404 reg = 1; half = 1;
|
|
|
1405 goto locking_shift;
|
|
|
1406 case 'n': /* locking shift 2 */
|
|
|
1407 reg = 2; half = 0;
|
|
|
1408 goto locking_shift;
|
|
|
1409 case '}': /* locking shift 2 right */
|
|
|
1410 reg = 2; half = 1;
|
|
|
1411 goto locking_shift;
|
|
|
1412 case 'o': /* locking shift 3 */
|
|
|
1413 reg = 3; half = 0;
|
|
|
1414 goto locking_shift;
|
|
|
1415 case '|': /* locking shift 3 right */
|
|
|
1416 reg = 3; half = 1;
|
|
|
1417 goto locking_shift;
|
|
|
1418
|
|
|
1419 /**** composite ****/
|
|
|
1420
|
|
|
1421 #ifdef ENABLE_COMPOSITE_CHARS
|
|
|
1422 case '0':
|
|
|
1423 iso->esc = ISO_ESC_START_COMPOSITE;
|
|
|
1424 *flags = (*flags & ISO_STATE_LOCK) |
|
|
|
1425 ISO_STATE_COMPOSITE;
|
|
|
1426 return 1;
|
|
|
1427
|
|
|
1428 case '1':
|
|
|
1429 iso->esc = ISO_ESC_END_COMPOSITE;
|
|
|
1430 *flags = (*flags & ISO_STATE_LOCK) &
|
|
|
1431 ~ISO_STATE_COMPOSITE;
|
|
|
1432 return 1;
|
|
|
1433 #else
|
|
|
1434 case '0': case '1': case '2': case '3': case '4':
|
|
|
1435 /* We simply return a flag indicating that some composite
|
|
|
1436 escape was seen. The caller will use the particular
|
|
|
1437 character to encode the appropriate "composite hack"
|
|
|
1438 character out of Vcharset_composite, so that we will
|
|
|
1439 preserve these values on output. */
|
|
|
1440 iso->esc = ISO_ESC_START_COMPOSITE;
|
|
|
1441 *flags &= ISO_STATE_LOCK;
|
|
|
1442 return 1;
|
|
|
1443 #endif /* ENABLE_COMPOSITE_CHARS */
|
|
|
1444
|
|
|
1445 /**** directionality ****/
|
|
|
1446
|
|
|
1447 case '[':
|
|
|
1448 iso->esc = ISO_ESC_5_11;
|
|
|
1449 goto not_done;
|
|
|
1450
|
|
|
1451 /**** designation ****/
|
|
|
1452
|
|
|
1453 case '$': /* multibyte charset prefix */
|
|
|
1454 iso->esc = ISO_ESC_2_4;
|
|
|
1455 goto not_done;
|
|
|
1456
|
|
|
1457 default:
|
|
|
1458 if (0x28 <= c && c <= 0x2F)
|
|
|
1459 {
|
|
|
1460 iso->esc = (enum iso_esc_flag) (c - 0x28 + ISO_ESC_2_8);
|
|
|
1461 goto not_done;
|
|
|
1462 }
|
|
|
1463
|
|
|
1464 /* This function is called with CODESYS equal to nil when
|
|
|
1465 doing coding-system detection. */
|
|
|
1466 if (!NILP (codesys)
|
|
|
1467 && XCODING_SYSTEM_ISO2022_ESCAPE_QUOTED (codesys)
|
|
|
1468 && fit_to_be_escape_quoted (c))
|
|
|
1469 {
|
|
|
1470 iso->esc = ISO_ESC_LITERAL;
|
|
|
1471 *flags &= ISO_STATE_LOCK;
|
|
|
1472 return 1;
|
|
|
1473 }
|
|
|
1474
|
|
|
1475 /* bzzzt! */
|
|
|
1476 goto error;
|
|
|
1477 }
|
|
|
1478
|
|
|
1479
|
|
|
1480
|
|
|
1481 /**** directionality ****/
|
|
|
1482
|
|
|
1483 case ISO_ESC_5_11: /* ISO6429 direction control */
|
|
|
1484 if (c == ']')
|
|
|
1485 {
|
|
|
1486 *flags &= (ISO_STATE_LOCK & ~ISO_STATE_R2L);
|
|
|
1487 goto directionality;
|
|
|
1488 }
|
|
|
1489 if (c == '0') iso->esc = ISO_ESC_5_11_0;
|
|
|
1490 else if (c == '1') iso->esc = ISO_ESC_5_11_1;
|
|
|
1491 else if (c == '2') iso->esc = ISO_ESC_5_11_2;
|
|
|
1492 else goto error;
|
|
|
1493 goto not_done;
|
|
|
1494
|
|
|
1495 case ISO_ESC_5_11_0:
|
|
|
1496 if (c == ']')
|
|
|
1497 {
|
|
|
1498 *flags &= (ISO_STATE_LOCK & ~ISO_STATE_R2L);
|
|
|
1499 goto directionality;
|
|
|
1500 }
|
|
|
1501 goto error;
|
|
|
1502
|
|
|
1503 case ISO_ESC_5_11_1:
|
|
|
1504 if (c == ']')
|
|
|
1505 {
|
|
|
1506 *flags = (ISO_STATE_LOCK & ~ISO_STATE_R2L);
|
|
|
1507 goto directionality;
|
|
|
1508 }
|
|
|
1509 goto error;
|
|
|
1510
|
|
|
1511 case ISO_ESC_5_11_2:
|
|
|
1512 if (c == ']')
|
|
|
1513 {
|
|
|
1514 *flags = (*flags & ISO_STATE_LOCK) | ISO_STATE_R2L;
|
|
|
1515 goto directionality;
|
|
|
1516 }
|
|
|
1517 goto error;
|
|
|
1518
|
|
|
1519 directionality:
|
|
|
1520 iso->esc = ISO_ESC_DIRECTIONALITY;
|
|
|
1521 /* Various junk here to attempt to preserve the direction sequences
|
|
|
1522 literally in the text if they would otherwise be swallowed due
|
|
|
1523 to invalid designations that don't show up as actual charset
|
|
|
1524 changes in the text. */
|
|
|
1525 if (iso->invalid_switch_dir)
|
|
|
1526 {
|
|
|
1527 /* We already inserted a direction switch literally into the
|
|
|
1528 text. We assume (#### this may not be right) that the
|
|
|
1529 next direction switch is the one going the other way,
|
|
|
1530 and we need to output that literally as well. */
|
|
|
1531 iso->output_literally = 1;
|
|
|
1532 iso->invalid_switch_dir = 0;
|
|
|
1533 }
|
|
|
1534 else
|
|
|
1535 {
|
|
|
1536 int jj;
|
|
|
1537
|
|
|
1538 /* If we are in the thrall of an invalid designation,
|
|
|
1539 then stick the directionality sequence literally into the
|
|
|
1540 output stream so it ends up in the original text again. */
|
|
|
1541 for (jj = 0; jj < 4; jj++)
|
|
|
1542 if (iso->invalid_designated[jj])
|
|
|
1543 break;
|
|
|
1544 if (jj < 4)
|
|
|
1545 {
|
|
|
1546 iso->output_literally = 1;
|
|
|
1547 iso->invalid_switch_dir = 1;
|
|
|
1548 }
|
|
|
1549 else
|
|
|
1550 /* Indicate that we haven't yet seen a valid designation,
|
|
|
1551 so that if a switch-dir is directly followed by an
|
|
|
1552 invalid designation, both get inserted literally. */
|
|
|
1553 iso->switched_dir_and_no_valid_charset_yet = 1;
|
|
|
1554 }
|
|
|
1555 return 1;
|
|
|
1556
|
|
|
1557
|
|
|
1558 /**** designation ****/
|
|
|
1559
|
|
|
1560 case ISO_ESC_2_4:
|
|
|
1561 if (0x28 <= c && c <= 0x2F)
|
|
|
1562 {
|
|
|
1563 iso->esc = (enum iso_esc_flag) (c - 0x28 + ISO_ESC_2_4_8);
|
|
|
1564 goto not_done;
|
|
|
1565 }
|
|
|
1566 if (0x40 <= c && c <= 0x42)
|
|
|
1567 {
|
|
|
1568 cs = charset_by_attributes_or_create_one (CHARSET_TYPE_94X94, c,
|
|
|
1569 *flags & ISO_STATE_R2L ?
|
|
|
1570 CHARSET_RIGHT_TO_LEFT :
|
|
|
1571 CHARSET_LEFT_TO_RIGHT);
|
|
|
1572 reg = 0;
|
|
|
1573 goto designated;
|
|
|
1574 }
|
|
|
1575 goto error;
|
|
|
1576
|
|
|
1577 default:
|
|
|
1578 {
|
|
|
1579 int type = -1;
|
|
|
1580
|
|
|
1581 if (iso->esc >= ISO_ESC_2_8 &&
|
|
|
1582 iso->esc <= ISO_ESC_2_15)
|
|
|
1583 {
|
|
|
1584 type = ((iso->esc >= ISO_ESC_2_12) ?
|
|
|
1585 CHARSET_TYPE_96 : CHARSET_TYPE_94);
|
|
|
1586 reg = (iso->esc - ISO_ESC_2_8) & 3;
|
|
|
1587 }
|
|
|
1588 else if (iso->esc >= ISO_ESC_2_4_8 &&
|
|
|
1589 iso->esc <= ISO_ESC_2_4_15)
|
|
|
1590 {
|
|
|
1591 type = ((iso->esc >= ISO_ESC_2_4_12) ?
|
|
|
1592 CHARSET_TYPE_96X96 : CHARSET_TYPE_94X94);
|
|
|
1593 reg = (iso->esc - ISO_ESC_2_4_8) & 3;
|
|
|
1594 }
|
|
|
1595 else
|
|
|
1596 {
|
|
|
1597 /* Can this ever be reached? -slb */
|
|
|
1598 abort ();
|
|
|
1599 goto error;
|
|
|
1600 }
|
|
|
1601
|
|
|
1602 if (c < '0' || c > '~' ||
|
|
|
1603 (c > 0x5F && (type == CHARSET_TYPE_94X94 ||
|
|
|
1604 type == CHARSET_TYPE_96X96)))
|
|
|
1605 goto error; /* bad final byte */
|
|
|
1606
|
|
|
1607 cs = charset_by_attributes_or_create_one (type, c,
|
|
|
1608 *flags & ISO_STATE_R2L ?
|
|
|
1609 CHARSET_RIGHT_TO_LEFT :
|
|
|
1610 CHARSET_LEFT_TO_RIGHT);
|
|
|
1611 goto designated;
|
|
|
1612 }
|
|
|
1613 }
|
|
|
1614
|
|
|
1615 not_done:
|
|
|
1616 iso->esc_bytes[iso->esc_bytes_index++] = (unsigned char) c;
|
|
|
1617 return -1;
|
|
|
1618
|
|
|
1619 single_shift:
|
|
|
1620 if (check_invalid_charsets && !CHARSETP (iso->charset[reg]))
|
|
|
1621 /* can't invoke something that ain't there. */
|
|
|
1622 goto error;
|
|
|
1623 iso->esc = ISO_ESC_SINGLE_SHIFT;
|
|
|
1624 *flags &= ISO_STATE_LOCK;
|
|
|
1625 if (reg == 2)
|
|
|
1626 *flags |= ISO_STATE_SS2;
|
|
|
1627 else
|
|
|
1628 *flags |= ISO_STATE_SS3;
|
|
|
1629 return 1;
|
|
|
1630
|
|
|
1631 locking_shift:
|
|
|
1632 if (check_invalid_charsets &&
|
|
|
1633 !CHARSETP (iso->charset[reg]))
|
|
|
1634 /* can't invoke something that ain't there. */
|
|
|
1635 goto error;
|
|
|
1636 if (half)
|
|
|
1637 iso->register_right = reg;
|
|
|
1638 else
|
|
|
1639 iso->register_left = reg;
|
|
|
1640 *flags &= ISO_STATE_LOCK;
|
|
|
1641 iso->esc = ISO_ESC_LOCKING_SHIFT;
|
|
|
1642 return 1;
|
|
|
1643
|
|
|
1644 designated:
|
|
|
1645 if (NILP (cs) && check_invalid_charsets)
|
|
|
1646 {
|
|
|
1647 abort ();
|
|
|
1648 /* #### This should never happen now that we automatically create
|
|
|
1649 temporary charsets as necessary. We should probably remove
|
|
|
1650 this code. --ben */
|
|
|
1651 iso->invalid_designated[reg] = 1;
|
|
|
1652 iso->charset[reg] = Vcharset_ascii;
|
|
|
1653 iso->esc = ISO_ESC_DESIGNATE;
|
|
|
1654 *flags &= ISO_STATE_LOCK;
|
|
|
1655 iso->output_literally = 1;
|
|
|
1656 if (iso->switched_dir_and_no_valid_charset_yet)
|
|
|
1657 {
|
|
|
1658 /* We encountered a switch-direction followed by an
|
|
|
1659 invalid designation. Ensure that the switch-direction
|
|
|
1660 gets outputted; otherwise it will probably get eaten
|
|
|
1661 when the text is written out again. */
|
|
|
1662 iso->switched_dir_and_no_valid_charset_yet = 0;
|
|
|
1663 iso->output_direction_sequence = 1;
|
|
|
1664 /* And make sure that the switch-dir going the other
|
|
|
1665 way gets outputted, as well. */
|
|
|
1666 iso->invalid_switch_dir = 1;
|
|
|
1667 }
|
|
|
1668 return 1;
|
|
|
1669 }
|
|
|
1670 /* This function is called with CODESYS equal to nil when
|
|
|
1671 doing coding-system detection. */
|
|
|
1672 if (!NILP (codesys))
|
|
|
1673 {
|
|
|
1674 charset_conversion_spec_dynarr *dyn =
|
|
|
1675 XCODING_SYSTEM_ISO2022_INPUT_CONV (codesys);
|
|
|
1676
|
|
|
1677 if (dyn)
|
|
|
1678 {
|
|
|
1679 int i;
|
|
|
1680
|
|
|
1681 for (i = 0; i < Dynarr_length (dyn); i++)
|
|
|
1682 {
|
|
|
1683 struct charset_conversion_spec *spec = Dynarr_atp (dyn, i);
|
|
|
1684 if (EQ (cs, spec->from_charset))
|
|
|
1685 cs = spec->to_charset;
|
|
|
1686 }
|
|
|
1687 }
|
|
|
1688 }
|
|
|
1689
|
|
|
1690 iso->charset[reg] = cs;
|
|
|
1691 iso->esc = ISO_ESC_DESIGNATE;
|
|
|
1692 *flags &= ISO_STATE_LOCK;
|
|
|
1693 if (iso->invalid_designated[reg])
|
|
|
1694 {
|
|
|
1695 iso->invalid_designated[reg] = 0;
|
|
|
1696 iso->output_literally = 1;
|
|
|
1697 }
|
|
|
1698 if (iso->switched_dir_and_no_valid_charset_yet)
|
|
|
1699 iso->switched_dir_and_no_valid_charset_yet = 0;
|
|
|
1700 return 1;
|
|
|
1701 }
|
|
|
1702
|
|
|
1703 /* If FLAGS is a null pointer or specifies right-to-left motion,
|
|
|
1704 output a switch-dir-to-left-to-right sequence to DST.
|
|
|
1705 Also update FLAGS if it is not a null pointer.
|
|
|
1706 If INTERNAL_P is set, we are outputting in internal format and
|
|
|
1707 need to handle the CSI differently. */
|
|
|
1708
|
|
|
1709 static void
|
|
|
1710 restore_left_to_right_direction (Lisp_Object codesys,
|
|
|
1711 unsigned_char_dynarr *dst,
|
|
|
1712 unsigned int *flags,
|
|
|
1713 int internal_p)
|
|
|
1714 {
|
|
|
1715 if (!flags || (*flags & ISO_STATE_R2L))
|
|
|
1716 {
|
|
|
1717 if (XCODING_SYSTEM_ISO2022_SEVEN (codesys))
|
|
|
1718 {
|
|
|
1719 Dynarr_add (dst, ISO_CODE_ESC);
|
|
|
1720 Dynarr_add (dst, '[');
|
|
|
1721 }
|
|
|
1722 else if (internal_p)
|
|
|
1723 DECODE_ADD_BINARY_CHAR (ISO_CODE_CSI, dst);
|
|
|
1724 else
|
|
|
1725 Dynarr_add (dst, ISO_CODE_CSI);
|
|
|
1726 Dynarr_add (dst, '0');
|
|
|
1727 Dynarr_add (dst, ']');
|
|
|
1728 if (flags)
|
|
|
1729 *flags &= ~ISO_STATE_R2L;
|
|
|
1730 }
|
|
|
1731 }
|
|
|
1732
|
|
|
1733 /* If FLAGS is a null pointer or specifies a direction different from
|
|
|
1734 DIRECTION (which should be either CHARSET_RIGHT_TO_LEFT or
|
|
|
1735 CHARSET_LEFT_TO_RIGHT), output the appropriate switch-dir escape
|
|
|
1736 sequence to DST. Also update FLAGS if it is not a null pointer.
|
|
|
1737 If INTERNAL_P is set, we are outputting in internal format and
|
|
|
1738 need to handle the CSI differently. */
|
|
|
1739
|
|
|
1740 static void
|
|
|
1741 ensure_correct_direction (int direction, Lisp_Object codesys,
|
|
|
1742 unsigned_char_dynarr *dst, unsigned int *flags,
|
|
|
1743 int internal_p)
|
|
|
1744 {
|
|
|
1745 if ((!flags || (*flags & ISO_STATE_R2L)) &&
|
|
|
1746 direction == CHARSET_LEFT_TO_RIGHT)
|
|
|
1747 restore_left_to_right_direction (codesys, dst, flags, internal_p);
|
|
|
1748 else if (!XCODING_SYSTEM_ISO2022_NO_ISO6429 (codesys)
|
|
|
1749 && (!flags || !(*flags & ISO_STATE_R2L)) &&
|
|
|
1750 direction == CHARSET_RIGHT_TO_LEFT)
|
|
|
1751 {
|
|
|
1752 if (XCODING_SYSTEM_ISO2022_SEVEN (codesys))
|
|
|
1753 {
|
|
|
1754 Dynarr_add (dst, ISO_CODE_ESC);
|
|
|
1755 Dynarr_add (dst, '[');
|
|
|
1756 }
|
|
|
1757 else if (internal_p)
|
|
|
1758 DECODE_ADD_BINARY_CHAR (ISO_CODE_CSI, dst);
|
|
|
1759 else
|
|
|
1760 Dynarr_add (dst, ISO_CODE_CSI);
|
|
|
1761 Dynarr_add (dst, '2');
|
|
|
1762 Dynarr_add (dst, ']');
|
|
|
1763 if (flags)
|
|
|
1764 *flags |= ISO_STATE_R2L;
|
|
|
1765 }
|
|
|
1766 }
|
|
|
1767
|
|
|
1768 /* Convert ISO2022-format data to internal format. */
|
|
|
1769
|
|
|
1770 static Bytecount
|
|
|
1771 iso2022_decode (struct coding_stream *str, const UExtbyte *src,
|
|
|
1772 unsigned_char_dynarr *dst, Bytecount n)
|
|
|
1773 {
|
|
|
1774 unsigned int ch = str->ch;
|
|
|
1775 #ifdef ENABLE_COMPOSITE_CHARS
|
|
|
1776 unsigned_char_dynarr *real_dst = dst;
|
|
|
1777 #endif
|
|
|
1778 struct iso2022_coding_stream *data =
|
|
|
1779 CODING_STREAM_TYPE_DATA (str, iso2022);
|
|
|
1780 unsigned int flags = data->flags;
|
|
|
1781 Bytecount orign = n;
|
|
|
1782
|
|
|
1783 #ifdef ENABLE_COMPOSITE_CHARS
|
|
|
1784 if (flags & ISO_STATE_COMPOSITE)
|
|
|
1785 dst = data->composite_chars;
|
|
|
1786 #endif /* ENABLE_COMPOSITE_CHARS */
|
|
|
1787
|
|
|
1788 while (n--)
|
|
|
1789 {
|
|
|
1790 UExtbyte c = *src++;
|
|
|
1791 if (flags & ISO_STATE_ESCAPE)
|
|
|
1792 { /* Within ESC sequence */
|
|
|
1793 int retval = parse_iso2022_esc (str->codesys, data,
|
|
|
1794 c, &flags, 1);
|
|
|
1795
|
|
|
1796 if (retval)
|
|
|
1797 {
|
|
|
1798 switch (data->esc)
|
|
|
1799 {
|
|
|
1800 #ifdef ENABLE_COMPOSITE_CHARS
|
|
|
1801 case ISO_ESC_START_COMPOSITE:
|
|
|
1802 if (data->composite_chars)
|
|
|
1803 Dynarr_reset (data->composite_chars);
|
|
|
1804 else
|
|
|
1805 data->composite_chars = Dynarr_new (unsigned_char);
|
|
|
1806 dst = data->composite_chars;
|
|
|
1807 break;
|
|
|
1808 case ISO_ESC_END_COMPOSITE:
|
|
|
1809 {
|
|
867
|
1810 Ibyte comstr[MAX_ICHAR_LEN];
|
|
771
|
1811 Bytecount len;
|
|
867
|
1812 Ichar emch = lookup_composite_char (Dynarr_atp (dst, 0),
|
|
771
|
1813 Dynarr_length (dst));
|
|
|
1814 dst = real_dst;
|
|
867
|
1815 len = set_itext_ichar (comstr, emch);
|
|
771
|
1816 Dynarr_add_many (dst, comstr, len);
|
|
|
1817 break;
|
|
|
1818 }
|
|
|
1819 #else
|
|
|
1820 case ISO_ESC_START_COMPOSITE:
|
|
|
1821 {
|
|
867
|
1822 Ibyte comstr[MAX_ICHAR_LEN];
|
|
771
|
1823 Bytecount len;
|
|
867
|
1824 Ichar emch = make_ichar (Vcharset_composite, c - '0' + ' ',
|
|
771
|
1825 0);
|
|
867
|
1826 len = set_itext_ichar (comstr, emch);
|
|
771
|
1827 Dynarr_add_many (dst, comstr, len);
|
|
|
1828 break;
|
|
|
1829 }
|
|
|
1830 #endif /* ENABLE_COMPOSITE_CHARS */
|
|
|
1831
|
|
|
1832 case ISO_ESC_LITERAL:
|
|
|
1833 DECODE_ADD_BINARY_CHAR (c, dst);
|
|
|
1834 break;
|
|
|
1835
|
|
|
1836 default:
|
|
|
1837 /* Everything else handled already */
|
|
|
1838 break;
|
|
|
1839 }
|
|
|
1840 }
|
|
|
1841
|
|
|
1842 /* Attempted error recovery. */
|
|
|
1843 if (data->output_direction_sequence)
|
|
|
1844 ensure_correct_direction (flags & ISO_STATE_R2L ?
|
|
|
1845 CHARSET_RIGHT_TO_LEFT :
|
|
|
1846 CHARSET_LEFT_TO_RIGHT,
|
|
|
1847 str->codesys, dst, 0, 1);
|
|
|
1848 /* More error recovery. */
|
|
|
1849 if (!retval || data->output_literally)
|
|
|
1850 {
|
|
|
1851 /* Output the (possibly invalid) sequence */
|
|
|
1852 int i;
|
|
|
1853 for (i = 0; i < data->esc_bytes_index; i++)
|
|
|
1854 DECODE_ADD_BINARY_CHAR (data->esc_bytes[i], dst);
|
|
|
1855 flags &= ISO_STATE_LOCK;
|
|
|
1856 if (!retval)
|
|
|
1857 n++, src--;/* Repeat the loop with the same character. */
|
|
|
1858 else
|
|
|
1859 {
|
|
|
1860 /* No sense in reprocessing the final byte of the
|
|
|
1861 escape sequence; it could mess things up anyway.
|
|
|
1862 Just add it now. */
|
|
|
1863 DECODE_ADD_BINARY_CHAR (c, dst);
|
|
|
1864 }
|
|
|
1865 }
|
|
|
1866 ch = 0;
|
|
|
1867 }
|
|
826
|
1868 else if (byte_c0_p (c) || byte_c1_p (c))
|
|
771
|
1869 { /* Control characters */
|
|
|
1870
|
|
|
1871 /***** Error-handling *****/
|
|
|
1872
|
|
|
1873 /* If we were in the middle of a character, dump out the
|
|
|
1874 partial character. */
|
|
|
1875 DECODE_OUTPUT_PARTIAL_CHAR (ch, dst);
|
|
|
1876
|
|
|
1877 /* If we just saw a single-shift character, dump it out.
|
|
|
1878 This may dump out the wrong sort of single-shift character,
|
|
|
1879 but least it will give an indication that something went
|
|
|
1880 wrong. */
|
|
|
1881 if (flags & ISO_STATE_SS2)
|
|
|
1882 {
|
|
|
1883 DECODE_ADD_BINARY_CHAR (ISO_CODE_SS2, dst);
|
|
|
1884 flags &= ~ISO_STATE_SS2;
|
|
|
1885 }
|
|
|
1886 if (flags & ISO_STATE_SS3)
|
|
|
1887 {
|
|
|
1888 DECODE_ADD_BINARY_CHAR (ISO_CODE_SS3, dst);
|
|
|
1889 flags &= ~ISO_STATE_SS3;
|
|
|
1890 }
|
|
|
1891
|
|
|
1892 /***** Now handle the control characters. *****/
|
|
|
1893
|
|
|
1894 flags &= ISO_STATE_LOCK;
|
|
|
1895
|
|
|
1896 if (!parse_iso2022_esc (str->codesys, data, c, &flags, 1))
|
|
|
1897 DECODE_ADD_BINARY_CHAR (c, dst);
|
|
|
1898 }
|
|
|
1899 else
|
|
|
1900 { /* Graphic characters */
|
|
|
1901 Lisp_Object charset;
|
|
|
1902 int lb;
|
|
|
1903 int reg;
|
|
|
1904
|
|
|
1905 /* Now determine the charset. */
|
|
|
1906 reg = ((flags & ISO_STATE_SS2) ? 2
|
|
|
1907 : (flags & ISO_STATE_SS3) ? 3
|
|
826
|
1908 : !byte_ascii_p (c) ? data->register_right
|
|
771
|
1909 : data->register_left);
|
|
|
1910 charset = data->charset[reg];
|
|
|
1911
|
|
|
1912 /* Error checking: */
|
|
|
1913 if (! CHARSETP (charset)
|
|
|
1914 || data->invalid_designated[reg]
|
|
|
1915 || (((c & 0x7F) == ' ' || (c & 0x7F) == ISO_CODE_DEL)
|
|
|
1916 && XCHARSET_CHARS (charset) == 94))
|
|
|
1917 /* Mrmph. We are trying to invoke a register that has no
|
|
|
1918 or an invalid charset in it, or trying to add a character
|
|
|
1919 outside the range of the charset. Insert that char literally
|
|
|
1920 to preserve it for the output. */
|
|
|
1921 {
|
|
|
1922 DECODE_OUTPUT_PARTIAL_CHAR (ch, dst);
|
|
|
1923 DECODE_ADD_BINARY_CHAR (c, dst);
|
|
|
1924 }
|
|
|
1925
|
|
|
1926 else
|
|
|
1927 {
|
|
|
1928 /* Things are probably hunky-dorey. */
|
|
|
1929
|
|
|
1930 /* Fetch reverse charset, maybe. */
|
|
|
1931 if (((flags & ISO_STATE_R2L) &&
|
|
|
1932 XCHARSET_DIRECTION (charset) == CHARSET_LEFT_TO_RIGHT)
|
|
|
1933 ||
|
|
|
1934 (!(flags & ISO_STATE_R2L) &&
|
|
|
1935 XCHARSET_DIRECTION (charset) == CHARSET_RIGHT_TO_LEFT))
|
|
|
1936 {
|
|
|
1937 Lisp_Object new_charset =
|
|
|
1938 XCHARSET_REVERSE_DIRECTION_CHARSET (charset);
|
|
|
1939 if (!NILP (new_charset))
|
|
|
1940 charset = new_charset;
|
|
|
1941 }
|
|
|
1942
|
|
|
1943 lb = XCHARSET_LEADING_BYTE (charset);
|
|
|
1944 switch (XCHARSET_REP_BYTES (charset))
|
|
|
1945 {
|
|
|
1946 case 1: /* ASCII */
|
|
|
1947 DECODE_OUTPUT_PARTIAL_CHAR (ch, dst);
|
|
|
1948 Dynarr_add (dst, c & 0x7F);
|
|
|
1949 break;
|
|
|
1950
|
|
|
1951 case 2: /* one-byte official */
|
|
|
1952 DECODE_OUTPUT_PARTIAL_CHAR (ch, dst);
|
|
|
1953 Dynarr_add (dst, lb);
|
|
|
1954 Dynarr_add (dst, c | 0x80);
|
|
|
1955 break;
|
|
|
1956
|
|
|
1957 case 3: /* one-byte private or two-byte official */
|
|
|
1958 if (XCHARSET_PRIVATE_P (charset))
|
|
|
1959 {
|
|
|
1960 DECODE_OUTPUT_PARTIAL_CHAR (ch, dst);
|
|
|
1961 Dynarr_add (dst, PRE_LEADING_BYTE_PRIVATE_1);
|
|
|
1962 Dynarr_add (dst, lb);
|
|
|
1963 Dynarr_add (dst, c | 0x80);
|
|
|
1964 }
|
|
|
1965 else
|
|
|
1966 {
|
|
|
1967 if (ch)
|
|
|
1968 {
|
|
|
1969 Dynarr_add (dst, lb);
|
|
|
1970 Dynarr_add (dst, ch | 0x80);
|
|
|
1971 Dynarr_add (dst, c | 0x80);
|
|
|
1972 ch = 0;
|
|
|
1973 }
|
|
|
1974 else
|
|
|
1975 ch = c;
|
|
|
1976 }
|
|
|
1977 break;
|
|
|
1978
|
|
|
1979 default: /* two-byte private */
|
|
|
1980 if (ch)
|
|
|
1981 {
|
|
|
1982 Dynarr_add (dst, PRE_LEADING_BYTE_PRIVATE_2);
|
|
|
1983 Dynarr_add (dst, lb);
|
|
|
1984 Dynarr_add (dst, ch | 0x80);
|
|
|
1985 Dynarr_add (dst, c | 0x80);
|
|
|
1986 ch = 0;
|
|
|
1987 }
|
|
|
1988 else
|
|
|
1989 ch = c;
|
|
|
1990 }
|
|
|
1991 }
|
|
|
1992
|
|
|
1993 if (!ch)
|
|
|
1994 flags &= ISO_STATE_LOCK;
|
|
|
1995 }
|
|
|
1996
|
|
|
1997 }
|
|
|
1998
|
|
|
1999 if (str->eof)
|
|
|
2000 DECODE_OUTPUT_PARTIAL_CHAR (ch, dst);
|
|
|
2001
|
|
|
2002 data->flags = flags;
|
|
|
2003 str->ch = ch;
|
|
|
2004 return orign;
|
|
|
2005 }
|
|
|
2006
|
|
|
2007
|
|
|
2008 /***** ISO2022 encoder *****/
|
|
|
2009
|
|
|
2010 /* Designate CHARSET into register REG. */
|
|
|
2011
|
|
|
2012 static void
|
|
|
2013 iso2022_designate (Lisp_Object charset, int reg,
|
|
|
2014 struct coding_stream *str, unsigned_char_dynarr *dst)
|
|
|
2015 {
|
|
|
2016 static const char inter94[] = "()*+";
|
|
|
2017 static const char inter96[] = ",-./";
|
|
|
2018 int type;
|
|
|
2019 unsigned char final;
|
|
|
2020 struct iso2022_coding_stream *data =
|
|
|
2021 CODING_STREAM_TYPE_DATA (str, iso2022);
|
|
|
2022 Lisp_Object old_charset = data->charset[reg];
|
|
|
2023
|
|
|
2024 data->charset[reg] = charset;
|
|
|
2025 if (!CHARSETP (charset))
|
|
|
2026 /* charset might be an initial nil or t. */
|
|
|
2027 return;
|
|
|
2028 type = XCHARSET_TYPE (charset);
|
|
|
2029 final = XCHARSET_FINAL (charset);
|
|
|
2030 if (!data->force_charset_on_output[reg] &&
|
|
|
2031 CHARSETP (old_charset) &&
|
|
|
2032 XCHARSET_TYPE (old_charset) == type &&
|
|
|
2033 XCHARSET_FINAL (old_charset) == final)
|
|
|
2034 return;
|
|
|
2035
|
|
|
2036 data->force_charset_on_output[reg] = 0;
|
|
|
2037
|
|
|
2038 {
|
|
|
2039 charset_conversion_spec_dynarr *dyn =
|
|
|
2040 XCODING_SYSTEM_ISO2022_OUTPUT_CONV (str->codesys);
|
|
|
2041
|
|
|
2042 if (dyn)
|
|
|
2043 {
|
|
|
2044 int i;
|
|
|
2045
|
|
|
2046 for (i = 0; i < Dynarr_length (dyn); i++)
|
|
|
2047 {
|
|
|
2048 struct charset_conversion_spec *spec = Dynarr_atp (dyn, i);
|
|
|
2049 if (EQ (charset, spec->from_charset))
|
|
|
2050 charset = spec->to_charset;
|
|
|
2051 }
|
|
|
2052 }
|
|
|
2053 }
|
|
|
2054
|
|
|
2055 Dynarr_add (dst, ISO_CODE_ESC);
|
|
|
2056 switch (type)
|
|
|
2057 {
|
|
|
2058 case CHARSET_TYPE_94:
|
|
|
2059 Dynarr_add (dst, inter94[reg]);
|
|
|
2060 break;
|
|
|
2061 case CHARSET_TYPE_96:
|
|
|
2062 Dynarr_add (dst, inter96[reg]);
|
|
|
2063 break;
|
|
|
2064 case CHARSET_TYPE_94X94:
|
|
|
2065 Dynarr_add (dst, '$');
|
|
|
2066 if (reg != 0
|
|
|
2067 || !(XCODING_SYSTEM_ISO2022_SHORT (str->codesys))
|
|
|
2068 || final < '@'
|
|
|
2069 || final > 'B')
|
|
|
2070 Dynarr_add (dst, inter94[reg]);
|
|
|
2071 break;
|
|
|
2072 case CHARSET_TYPE_96X96:
|
|
|
2073 Dynarr_add (dst, '$');
|
|
|
2074 Dynarr_add (dst, inter96[reg]);
|
|
|
2075 break;
|
|
|
2076 }
|
|
|
2077 Dynarr_add (dst, final);
|
|
|
2078 }
|
|
|
2079
|
|
|
2080 static void
|
|
|
2081 ensure_normal_shift (struct coding_stream *str, unsigned_char_dynarr *dst)
|
|
|
2082 {
|
|
|
2083 struct iso2022_coding_stream *data =
|
|
|
2084 CODING_STREAM_TYPE_DATA (str, iso2022);
|
|
|
2085
|
|
|
2086 if (data->register_left != 0)
|
|
|
2087 {
|
|
|
2088 Dynarr_add (dst, ISO_CODE_SI);
|
|
|
2089 data->register_left = 0;
|
|
|
2090 }
|
|
|
2091 }
|
|
|
2092
|
|
|
2093 static void
|
|
|
2094 ensure_shift_out (struct coding_stream *str, unsigned_char_dynarr *dst)
|
|
|
2095 {
|
|
|
2096 struct iso2022_coding_stream *data =
|
|
|
2097 CODING_STREAM_TYPE_DATA (str, iso2022);
|
|
|
2098
|
|
|
2099 if (data->register_left != 1)
|
|
|
2100 {
|
|
|
2101 Dynarr_add (dst, ISO_CODE_SO);
|
|
|
2102 data->register_left = 1;
|
|
|
2103 }
|
|
|
2104 }
|
|
|
2105
|
|
|
2106 /* Convert internally-formatted data to ISO2022 format. */
|
|
|
2107
|
|
|
2108 static Bytecount
|
|
867
|
2109 iso2022_encode (struct coding_stream *str, const Ibyte *src,
|
|
771
|
2110 unsigned_char_dynarr *dst, Bytecount n)
|
|
|
2111 {
|
|
|
2112 unsigned char charmask;
|
|
867
|
2113 Ibyte c;
|
|
771
|
2114 unsigned char char_boundary;
|
|
|
2115 unsigned int ch = str->ch;
|
|
|
2116 Lisp_Object codesys = str->codesys;
|
|
|
2117 int i;
|
|
|
2118 Lisp_Object charset;
|
|
|
2119 int half;
|
|
|
2120 struct iso2022_coding_stream *data =
|
|
|
2121 CODING_STREAM_TYPE_DATA (str, iso2022);
|
|
|
2122 unsigned int flags = data->flags;
|
|
|
2123 Bytecount orign = n;
|
|
|
2124
|
|
|
2125 #ifdef ENABLE_COMPOSITE_CHARS
|
|
|
2126 /* flags for handling composite chars. We do a little switcheroo
|
|
|
2127 on the source while we're outputting the composite char. */
|
|
|
2128 Bytecount saved_n = 0;
|
|
867
|
2129 const Ibyte *saved_src = NULL;
|
|
771
|
2130 int in_composite = 0;
|
|
|
2131 #endif /* ENABLE_COMPOSITE_CHARS */
|
|
|
2132
|
|
|
2133 char_boundary = data->current_char_boundary;
|
|
|
2134 charset = data->current_charset;
|
|
|
2135 half = data->current_half;
|
|
|
2136
|
|
|
2137 #ifdef ENABLE_COMPOSITE_CHARS
|
|
|
2138 back_to_square_n:
|
|
|
2139 #endif
|
|
|
2140 while (n--)
|
|
|
2141 {
|
|
|
2142 c = *src++;
|
|
|
2143
|
|
826
|
2144 if (byte_ascii_p (c))
|
|
771
|
2145 { /* Processing ASCII character */
|
|
|
2146 ch = 0;
|
|
|
2147
|
|
|
2148 restore_left_to_right_direction (codesys, dst, &flags, 0);
|
|
|
2149
|
|
|
2150 /* Make sure G0 contains ASCII */
|
|
|
2151 if ((c > ' ' && c < ISO_CODE_DEL) ||
|
|
|
2152 !XCODING_SYSTEM_ISO2022_NO_ASCII_CNTL (codesys))
|
|
|
2153 {
|
|
|
2154 ensure_normal_shift (str, dst);
|
|
|
2155 iso2022_designate (Vcharset_ascii, 0, str, dst);
|
|
|
2156 }
|
|
|
2157
|
|
|
2158 /* If necessary, restore everything to the default state
|
|
|
2159 at end-of-line */
|
|
|
2160 if (!(XCODING_SYSTEM_ISO2022_NO_ASCII_EOL (codesys)))
|
|
|
2161 {
|
|
|
2162 /* NOTE: CRLF encoding happens *BEFORE* other encoding.
|
|
|
2163 Thus, even though we're working with internal-format
|
|
|
2164 data, there may be CR's or CRLF sequences representing
|
|
|
2165 newlines. */
|
|
|
2166 if (c == '\r' || (c == '\n' && !(flags & ISO_STATE_CR)))
|
|
|
2167 {
|
|
|
2168 restore_left_to_right_direction (codesys, dst, &flags, 0);
|
|
|
2169
|
|
|
2170 ensure_normal_shift (str, dst);
|
|
|
2171
|
|
|
2172 for (i = 0; i < 4; i++)
|
|
|
2173 {
|
|
|
2174 Lisp_Object initial_charset =
|
|
|
2175 XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i);
|
|
|
2176 iso2022_designate (initial_charset, i, str, dst);
|
|
|
2177 }
|
|
|
2178 }
|
|
|
2179 if (c == '\r')
|
|
|
2180 flags |= ISO_STATE_CR;
|
|
|
2181 else
|
|
|
2182 flags &= ~ISO_STATE_CR;
|
|
|
2183 }
|
|
|
2184
|
|
|
2185 if (XCODING_SYSTEM_ISO2022_ESCAPE_QUOTED (codesys)
|
|
|
2186 && fit_to_be_escape_quoted (c))
|
|
|
2187 Dynarr_add (dst, ISO_CODE_ESC);
|
|
|
2188 Dynarr_add (dst, c);
|
|
|
2189 char_boundary = 1;
|
|
|
2190 }
|
|
|
2191
|
|
867
|
2192 else if (ibyte_leading_byte_p (c) || ibyte_leading_byte_p (ch))
|
|
771
|
2193 { /* Processing Leading Byte */
|
|
|
2194 ch = 0;
|
|
826
|
2195 charset = charset_by_leading_byte (c);
|
|
|
2196 if (leading_byte_prefix_p (c))
|
|
771
|
2197 ch = c;
|
|
|
2198 else if (!EQ (charset, Vcharset_control_1)
|
|
|
2199 && !EQ (charset, Vcharset_composite))
|
|
|
2200 {
|
|
|
2201 int reg;
|
|
|
2202
|
|
|
2203 ensure_correct_direction (XCHARSET_DIRECTION (charset),
|
|
|
2204 codesys, dst, &flags, 0);
|
|
|
2205
|
|
|
2206 /* Now determine which register to use. */
|
|
|
2207 reg = -1;
|
|
|
2208 for (i = 0; i < 4; i++)
|
|
|
2209 {
|
|
|
2210 if (EQ (charset, data->charset[i]) ||
|
|
|
2211 EQ (charset,
|
|
|
2212 XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i)))
|
|
|
2213 {
|
|
|
2214 reg = i;
|
|
|
2215 break;
|
|
|
2216 }
|
|
|
2217 }
|
|
|
2218
|
|
|
2219 if (reg == -1)
|
|
|
2220 {
|
|
|
2221 if (XCHARSET_GRAPHIC (charset) != 0)
|
|
|
2222 {
|
|
|
2223 if (!NILP (data->charset[1]) &&
|
|
|
2224 (!XCODING_SYSTEM_ISO2022_SEVEN (codesys) ||
|
|
|
2225 XCODING_SYSTEM_ISO2022_LOCK_SHIFT (codesys)))
|
|
|
2226 reg = 1;
|
|
|
2227 else if (!NILP (data->charset[2]))
|
|
|
2228 reg = 2;
|
|
|
2229 else if (!NILP (data->charset[3]))
|
|
|
2230 reg = 3;
|
|
|
2231 else
|
|
|
2232 reg = 0;
|
|
|
2233 }
|
|
|
2234 else
|
|
|
2235 reg = 0;
|
|
|
2236 }
|
|
|
2237
|
|
|
2238 iso2022_designate (charset, reg, str, dst);
|
|
|
2239
|
|
|
2240 /* Now invoke that register. */
|
|
|
2241 switch (reg)
|
|
|
2242 {
|
|
|
2243 case 0:
|
|
|
2244 ensure_normal_shift (str, dst);
|
|
|
2245 half = 0;
|
|
|
2246 break;
|
|
|
2247
|
|
|
2248 case 1:
|
|
|
2249 if (XCODING_SYSTEM_ISO2022_SEVEN (codesys))
|
|
|
2250 {
|
|
|
2251 ensure_shift_out (str, dst);
|
|
|
2252 half = 0;
|
|
|
2253 }
|
|
|
2254 else
|
|
|
2255 half = 1;
|
|
|
2256 break;
|
|
|
2257
|
|
|
2258 case 2:
|
|
|
2259 if (XCODING_SYSTEM_ISO2022_SEVEN (str->codesys))
|
|
|
2260 {
|
|
|
2261 Dynarr_add (dst, ISO_CODE_ESC);
|
|
|
2262 Dynarr_add (dst, 'N');
|
|
|
2263 half = 0;
|
|
|
2264 }
|
|
|
2265 else
|
|
|
2266 {
|
|
|
2267 Dynarr_add (dst, ISO_CODE_SS2);
|
|
|
2268 half = 1;
|
|
|
2269 }
|
|
|
2270 break;
|
|
|
2271
|
|
|
2272 case 3:
|
|
|
2273 if (XCODING_SYSTEM_ISO2022_SEVEN (str->codesys))
|
|
|
2274 {
|
|
|
2275 Dynarr_add (dst, ISO_CODE_ESC);
|
|
|
2276 Dynarr_add (dst, 'O');
|
|
|
2277 half = 0;
|
|
|
2278 }
|
|
|
2279 else
|
|
|
2280 {
|
|
|
2281 Dynarr_add (dst, ISO_CODE_SS3);
|
|
|
2282 half = 1;
|
|
|
2283 }
|
|
|
2284 break;
|
|
|
2285
|
|
|
2286 default:
|
|
|
2287 abort ();
|
|
|
2288 }
|
|
|
2289 }
|
|
|
2290 char_boundary = 0;
|
|
|
2291 }
|
|
|
2292 else
|
|
|
2293 { /* Processing Non-ASCII character */
|
|
|
2294 charmask = (half == 0 ? 0x7F : 0xFF);
|
|
|
2295 char_boundary = 1;
|
|
|
2296 if (EQ (charset, Vcharset_control_1))
|
|
|
2297 {
|
|
|
2298 if (XCODING_SYSTEM_ISO2022_ESCAPE_QUOTED (codesys)
|
|
|
2299 && fit_to_be_escape_quoted (c))
|
|
|
2300 Dynarr_add (dst, ISO_CODE_ESC);
|
|
|
2301 /* you asked for it ... */
|
|
|
2302 Dynarr_add (dst, c - 0x20);
|
|
|
2303 }
|
|
|
2304 #ifndef ENABLE_COMPOSITE_CHARS
|
|
|
2305 else if (EQ (charset, Vcharset_composite))
|
|
|
2306 {
|
|
|
2307 if (c >= 160 || c <= 164) /* Someone might have stuck in
|
|
|
2308 something else */
|
|
|
2309 {
|
|
|
2310 Dynarr_add (dst, ISO_CODE_ESC);
|
|
|
2311 Dynarr_add (dst, c - 160 + '0');
|
|
|
2312 }
|
|
|
2313 }
|
|
|
2314 #endif
|
|
|
2315 else
|
|
|
2316 {
|
|
|
2317 switch (XCHARSET_REP_BYTES (charset))
|
|
|
2318 {
|
|
|
2319 case 2:
|
|
|
2320 Dynarr_add (dst, c & charmask);
|
|
|
2321 break;
|
|
|
2322 case 3:
|
|
|
2323 if (XCHARSET_PRIVATE_P (charset))
|
|
|
2324 {
|
|
|
2325 Dynarr_add (dst, c & charmask);
|
|
|
2326 ch = 0;
|
|
|
2327 }
|
|
|
2328 else if (ch)
|
|
|
2329 {
|
|
|
2330 #ifdef ENABLE_COMPOSITE_CHARS
|
|
|
2331 if (EQ (charset, Vcharset_composite))
|
|
|
2332 {
|
|
|
2333 if (in_composite)
|
|
|
2334 {
|
|
|
2335 /* #### Bother! We don't know how to
|
|
|
2336 handle this yet. */
|
|
|
2337 Dynarr_add (dst, '~');
|
|
|
2338 }
|
|
|
2339 else
|
|
|
2340 {
|
|
867
|
2341 Ichar emch = make_ichar (Vcharset_composite,
|
|
771
|
2342 ch & 0x7F, c & 0x7F);
|
|
|
2343 Lisp_Object lstr = composite_char_string (emch);
|
|
|
2344 saved_n = n;
|
|
|
2345 saved_src = src;
|
|
|
2346 in_composite = 1;
|
|
|
2347 src = XSTRING_DATA (lstr);
|
|
|
2348 n = XSTRING_LENGTH (lstr);
|
|
|
2349 Dynarr_add (dst, ISO_CODE_ESC);
|
|
|
2350 Dynarr_add (dst, '0'); /* start composing */
|
|
|
2351 }
|
|
|
2352 }
|
|
|
2353 else
|
|
|
2354 #endif /* ENABLE_COMPOSITE_CHARS */
|
|
|
2355 {
|
|
|
2356 Dynarr_add (dst, ch & charmask);
|
|
|
2357 Dynarr_add (dst, c & charmask);
|
|
|
2358 }
|
|
|
2359 ch = 0;
|
|
|
2360 }
|
|
|
2361 else
|
|
|
2362 {
|
|
|
2363 ch = c;
|
|
|
2364 char_boundary = 0;
|
|
|
2365 }
|
|
|
2366 break;
|
|
|
2367 case 4:
|
|
|
2368 if (ch)
|
|
|
2369 {
|
|
|
2370 Dynarr_add (dst, ch & charmask);
|
|
|
2371 Dynarr_add (dst, c & charmask);
|
|
|
2372 ch = 0;
|
|
|
2373 }
|
|
|
2374 else
|
|
|
2375 {
|
|
|
2376 ch = c;
|
|
|
2377 char_boundary = 0;
|
|
|
2378 }
|
|
|
2379 break;
|
|
|
2380 default:
|
|
|
2381 abort ();
|
|
|
2382 }
|
|
|
2383 }
|
|
|
2384 }
|
|
|
2385 }
|
|
|
2386
|
|
|
2387 #ifdef ENABLE_COMPOSITE_CHARS
|
|
|
2388 if (in_composite)
|
|
|
2389 {
|
|
|
2390 n = saved_n;
|
|
|
2391 src = saved_src;
|
|
|
2392 in_composite = 0;
|
|
|
2393 Dynarr_add (dst, ISO_CODE_ESC);
|
|
|
2394 Dynarr_add (dst, '1'); /* end composing */
|
|
|
2395 goto back_to_square_n; /* Wheeeeeeeee ..... */
|
|
|
2396 }
|
|
|
2397 #endif /* ENABLE_COMPOSITE_CHARS */
|
|
|
2398
|
|
|
2399 if (char_boundary && str->eof)
|
|
|
2400 {
|
|
|
2401 restore_left_to_right_direction (codesys, dst, &flags, 0);
|
|
|
2402 ensure_normal_shift (str, dst);
|
|
|
2403 for (i = 0; i < 4; i++)
|
|
|
2404 {
|
|
|
2405 Lisp_Object initial_charset =
|
|
|
2406 XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i);
|
|
|
2407 iso2022_designate (initial_charset, i, str, dst);
|
|
|
2408 }
|
|
|
2409 }
|
|
|
2410
|
|
|
2411 data->flags = flags;
|
|
|
2412 str->ch = ch;
|
|
|
2413 data->current_char_boundary = char_boundary;
|
|
|
2414 data->current_charset = charset;
|
|
|
2415 data->current_half = half;
|
|
|
2416
|
|
|
2417 /* Verbum caro factum est! */
|
|
|
2418 return orign;
|
|
|
2419 }
|
|
|
2420
|
|
|
2421 static Bytecount
|
|
|
2422 iso2022_convert (struct coding_stream *str,
|
|
|
2423 const UExtbyte *src,
|
|
|
2424 unsigned_char_dynarr *dst, Bytecount n)
|
|
|
2425 {
|
|
|
2426 if (str->direction == CODING_DECODE)
|
|
|
2427 return iso2022_decode (str, src, dst, n);
|
|
|
2428 else
|
|
|
2429 return iso2022_encode (str, src, dst, n);
|
|
|
2430 }
|
|
|
2431
|
|
|
2432 static void
|
|
|
2433 iso2022_mark (Lisp_Object codesys)
|
|
|
2434 {
|
|
|
2435 int i;
|
|
|
2436
|
|
|
2437 for (i = 0; i < 4; i++)
|
|
|
2438 mark_object (XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i));
|
|
|
2439 if (XCODING_SYSTEM_ISO2022_INPUT_CONV (codesys))
|
|
|
2440 {
|
|
|
2441 for (i = 0;
|
|
|
2442 i < Dynarr_length (XCODING_SYSTEM_ISO2022_INPUT_CONV (codesys));
|
|
|
2443 i++)
|
|
|
2444 {
|
|
|
2445 struct charset_conversion_spec *ccs =
|
|
|
2446 Dynarr_atp (XCODING_SYSTEM_ISO2022_INPUT_CONV (codesys), i);
|
|
|
2447 mark_object (ccs->from_charset);
|
|
|
2448 mark_object (ccs->to_charset);
|
|
|
2449 }
|
|
|
2450 }
|
|
|
2451 if (XCODING_SYSTEM_ISO2022_OUTPUT_CONV (codesys))
|
|
|
2452 {
|
|
|
2453 for (i = 0;
|
|
|
2454 i < Dynarr_length (XCODING_SYSTEM_ISO2022_OUTPUT_CONV (codesys));
|
|
|
2455 i++)
|
|
|
2456 {
|
|
|
2457 struct charset_conversion_spec *ccs =
|
|
|
2458 Dynarr_atp (XCODING_SYSTEM_ISO2022_OUTPUT_CONV (codesys), i);
|
|
|
2459 mark_object (ccs->from_charset);
|
|
|
2460 mark_object (ccs->to_charset);
|
|
|
2461 }
|
|
|
2462 }
|
|
|
2463 }
|
|
|
2464
|
|
|
2465 static void
|
|
|
2466 iso2022_finalize (Lisp_Object cs)
|
|
|
2467 {
|
|
|
2468 if (XCODING_SYSTEM_ISO2022_INPUT_CONV (cs))
|
|
|
2469 {
|
|
|
2470 Dynarr_free (XCODING_SYSTEM_ISO2022_INPUT_CONV (cs));
|
|
|
2471 XCODING_SYSTEM_ISO2022_INPUT_CONV (cs) = 0;
|
|
|
2472 }
|
|
|
2473 if (XCODING_SYSTEM_ISO2022_OUTPUT_CONV (cs))
|
|
|
2474 {
|
|
|
2475 Dynarr_free (XCODING_SYSTEM_ISO2022_OUTPUT_CONV (cs));
|
|
|
2476 XCODING_SYSTEM_ISO2022_OUTPUT_CONV (cs) = 0;
|
|
|
2477 }
|
|
|
2478 }
|
|
|
2479
|
|
|
2480 /* Given a list of charset conversion specs as specified in a Lisp
|
|
|
2481 program, parse it into STORE_HERE. */
|
|
|
2482
|
|
|
2483 static void
|
|
|
2484 parse_charset_conversion_specs (charset_conversion_spec_dynarr *store_here,
|
|
|
2485 Lisp_Object spec_list)
|
|
|
2486 {
|
|
|
2487 Lisp_Object rest;
|
|
|
2488
|
|
|
2489 EXTERNAL_LIST_LOOP (rest, spec_list)
|
|
|
2490 {
|
|
|
2491 Lisp_Object car = XCAR (rest);
|
|
|
2492 Lisp_Object from, to;
|
|
|
2493 struct charset_conversion_spec spec;
|
|
|
2494
|
|
|
2495 if (!CONSP (car) || !CONSP (XCDR (car)) || !NILP (XCDR (XCDR (car))))
|
|
|
2496 invalid_argument ("Invalid charset conversion spec", car);
|
|
|
2497 from = Fget_charset (XCAR (car));
|
|
|
2498 to = Fget_charset (XCAR (XCDR (car)));
|
|
|
2499 if (XCHARSET_TYPE (from) != XCHARSET_TYPE (to))
|
|
|
2500 invalid_operation_2
|
|
|
2501 ("Attempted conversion between different charset types",
|
|
|
2502 from, to);
|
|
|
2503 spec.from_charset = from;
|
|
|
2504 spec.to_charset = to;
|
|
|
2505
|
|
|
2506 Dynarr_add (store_here, spec);
|
|
|
2507 }
|
|
|
2508 }
|
|
|
2509
|
|
|
2510 /* Given a dynarr LOAD_HERE of internally-stored charset conversion
|
|
|
2511 specs, return the equivalent as the Lisp programmer would see it.
|
|
|
2512
|
|
|
2513 If LOAD_HERE is 0, return Qnil. */
|
|
|
2514
|
|
|
2515 static Lisp_Object
|
|
|
2516 unparse_charset_conversion_specs (charset_conversion_spec_dynarr *load_here,
|
|
|
2517 int names)
|
|
|
2518 {
|
|
|
2519 int i;
|
|
|
2520 Lisp_Object result;
|
|
|
2521
|
|
|
2522 if (!load_here)
|
|
|
2523 return Qnil;
|
|
|
2524 for (i = 0, result = Qnil; i < Dynarr_length (load_here); i++)
|
|
|
2525 {
|
|
|
2526 struct charset_conversion_spec *ccs = Dynarr_atp (load_here, i);
|
|
|
2527 if (names)
|
|
|
2528 result = Fcons (list2 (XCHARSET_NAME (ccs->from_charset),
|
|
|
2529 XCHARSET_NAME (ccs->to_charset)), result);
|
|
|
2530 else
|
|
|
2531 result = Fcons (list2 (ccs->from_charset, ccs->to_charset), result);
|
|
|
2532 }
|
|
|
2533
|
|
|
2534 return Fnreverse (result);
|
|
|
2535 }
|
|
|
2536
|
|
|
2537 static int
|
|
|
2538 iso2022_putprop (Lisp_Object codesys,
|
|
|
2539 Lisp_Object key,
|
|
|
2540 Lisp_Object value)
|
|
|
2541 {
|
|
|
2542 #define FROB_INITIAL_CHARSET(charset_num) \
|
|
|
2543 XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, charset_num) = \
|
|
|
2544 ((EQ (value, Qt) || EQ (value, Qnil)) ? value : Fget_charset (value))
|
|
|
2545
|
|
|
2546 if (EQ (key, Qcharset_g0)) FROB_INITIAL_CHARSET (0);
|
|
|
2547 else if (EQ (key, Qcharset_g1)) FROB_INITIAL_CHARSET (1);
|
|
|
2548 else if (EQ (key, Qcharset_g2)) FROB_INITIAL_CHARSET (2);
|
|
|
2549 else if (EQ (key, Qcharset_g3)) FROB_INITIAL_CHARSET (3);
|
|
|
2550
|
|
|
2551 #define FROB_FORCE_CHARSET(charset_num) \
|
|
|
2552 XCODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT (codesys, charset_num) = \
|
|
|
2553 !NILP (value)
|
|
|
2554
|
|
|
2555 else if (EQ (key, Qforce_g0_on_output)) FROB_FORCE_CHARSET (0);
|
|
|
2556 else if (EQ (key, Qforce_g1_on_output)) FROB_FORCE_CHARSET (1);
|
|
|
2557 else if (EQ (key, Qforce_g2_on_output)) FROB_FORCE_CHARSET (2);
|
|
|
2558 else if (EQ (key, Qforce_g3_on_output)) FROB_FORCE_CHARSET (3);
|
|
|
2559
|
|
|
2560 #define FROB_BOOLEAN_PROPERTY(prop) \
|
|
|
2561 XCODING_SYSTEM_ISO2022_##prop (codesys) = !NILP (value)
|
|
|
2562
|
|
|
2563 else if (EQ (key, Qshort)) FROB_BOOLEAN_PROPERTY (SHORT);
|
|
|
2564 else if (EQ (key, Qno_ascii_eol)) FROB_BOOLEAN_PROPERTY (NO_ASCII_EOL);
|
|
|
2565 else if (EQ (key, Qno_ascii_cntl)) FROB_BOOLEAN_PROPERTY (NO_ASCII_CNTL);
|
|
|
2566 else if (EQ (key, Qseven)) FROB_BOOLEAN_PROPERTY (SEVEN);
|
|
|
2567 else if (EQ (key, Qlock_shift)) FROB_BOOLEAN_PROPERTY (LOCK_SHIFT);
|
|
|
2568 else if (EQ (key, Qno_iso6429)) FROB_BOOLEAN_PROPERTY (NO_ISO6429);
|
|
|
2569 else if (EQ (key, Qescape_quoted)) FROB_BOOLEAN_PROPERTY (ESCAPE_QUOTED);
|
|
|
2570
|
|
|
2571 else if (EQ (key, Qinput_charset_conversion))
|
|
|
2572 {
|
|
|
2573 XCODING_SYSTEM_ISO2022_INPUT_CONV (codesys) =
|
|
|
2574 Dynarr_new (charset_conversion_spec);
|
|
|
2575 parse_charset_conversion_specs
|
|
|
2576 (XCODING_SYSTEM_ISO2022_INPUT_CONV (codesys), value);
|
|
|
2577 }
|
|
|
2578 else if (EQ (key, Qoutput_charset_conversion))
|
|
|
2579 {
|
|
|
2580 XCODING_SYSTEM_ISO2022_OUTPUT_CONV (codesys) =
|
|
|
2581 Dynarr_new (charset_conversion_spec);
|
|
|
2582 parse_charset_conversion_specs
|
|
|
2583 (XCODING_SYSTEM_ISO2022_OUTPUT_CONV (codesys), value);
|
|
|
2584 }
|
|
|
2585 else
|
|
|
2586 return 0;
|
|
|
2587
|
|
|
2588 return 1;
|
|
|
2589 }
|
|
|
2590
|
|
|
2591 static void
|
|
|
2592 iso2022_finalize_coding_stream (struct coding_stream *str)
|
|
|
2593 {
|
|
|
2594 #ifdef ENABLE_COMPOSITE_CHARS
|
|
|
2595 struct iso2022_coding_stream *data =
|
|
|
2596 CODING_STREAM_TYPE_DATA (str, iso2022);
|
|
|
2597
|
|
|
2598 if (data->composite_chars)
|
|
|
2599 Dynarr_free (data->composite_chars);
|
|
|
2600 #endif
|
|
|
2601 }
|
|
|
2602
|
|
|
2603 static void
|
|
|
2604 iso2022_init (Lisp_Object codesys)
|
|
|
2605 {
|
|
|
2606 int i;
|
|
|
2607 for (i = 0; i < 4; i++)
|
|
|
2608 XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i) = Qnil;
|
|
|
2609 }
|
|
|
2610
|
|
|
2611 static Lisp_Object
|
|
|
2612 coding_system_charset (Lisp_Object coding_system, int gnum)
|
|
|
2613 {
|
|
|
2614 Lisp_Object cs
|
|
|
2615 = XCODING_SYSTEM_ISO2022_INITIAL_CHARSET (coding_system, gnum);
|
|
|
2616
|
|
|
2617 return CHARSETP (cs) ? XCHARSET_NAME (cs) : Qnil;
|
|
|
2618 }
|
|
|
2619
|
|
|
2620 static Lisp_Object
|
|
|
2621 iso2022_getprop (Lisp_Object coding_system, Lisp_Object prop)
|
|
|
2622 {
|
|
|
2623 if (EQ (prop, Qcharset_g0))
|
|
|
2624 return coding_system_charset (coding_system, 0);
|
|
|
2625 else if (EQ (prop, Qcharset_g1))
|
|
|
2626 return coding_system_charset (coding_system, 1);
|
|
|
2627 else if (EQ (prop, Qcharset_g2))
|
|
|
2628 return coding_system_charset (coding_system, 2);
|
|
|
2629 else if (EQ (prop, Qcharset_g3))
|
|
|
2630 return coding_system_charset (coding_system, 3);
|
|
|
2631
|
|
|
2632 #define FORCE_CHARSET(charset_num) \
|
|
|
2633 (XCODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT \
|
|
|
2634 (coding_system, charset_num) ? Qt : Qnil)
|
|
|
2635
|
|
|
2636 else if (EQ (prop, Qforce_g0_on_output))
|
|
|
2637 return FORCE_CHARSET (0);
|
|
|
2638 else if (EQ (prop, Qforce_g1_on_output))
|
|
|
2639 return FORCE_CHARSET (1);
|
|
|
2640 else if (EQ (prop, Qforce_g2_on_output))
|
|
|
2641 return FORCE_CHARSET (2);
|
|
|
2642 else if (EQ (prop, Qforce_g3_on_output))
|
|
|
2643 return FORCE_CHARSET (3);
|
|
|
2644
|
|
|
2645 #define LISP_BOOLEAN(prop) \
|
|
|
2646 (XCODING_SYSTEM_ISO2022_##prop (coding_system) ? Qt : Qnil)
|
|
|
2647
|
|
|
2648 else if (EQ (prop, Qshort)) return LISP_BOOLEAN (SHORT);
|
|
|
2649 else if (EQ (prop, Qno_ascii_eol)) return LISP_BOOLEAN (NO_ASCII_EOL);
|
|
|
2650 else if (EQ (prop, Qno_ascii_cntl)) return LISP_BOOLEAN (NO_ASCII_CNTL);
|
|
|
2651 else if (EQ (prop, Qseven)) return LISP_BOOLEAN (SEVEN);
|
|
|
2652 else if (EQ (prop, Qlock_shift)) return LISP_BOOLEAN (LOCK_SHIFT);
|
|
|
2653 else if (EQ (prop, Qno_iso6429)) return LISP_BOOLEAN (NO_ISO6429);
|
|
|
2654 else if (EQ (prop, Qescape_quoted)) return LISP_BOOLEAN (ESCAPE_QUOTED);
|
|
|
2655
|
|
|
2656 else if (EQ (prop, Qinput_charset_conversion))
|
|
|
2657 return
|
|
|
2658 unparse_charset_conversion_specs
|
|
|
2659 (XCODING_SYSTEM_ISO2022_INPUT_CONV (coding_system), 0);
|
|
|
2660 else if (EQ (prop, Qoutput_charset_conversion))
|
|
|
2661 return
|
|
|
2662 unparse_charset_conversion_specs
|
|
|
2663 (XCODING_SYSTEM_ISO2022_OUTPUT_CONV (coding_system), 0);
|
|
|
2664 else
|
|
|
2665 return Qunbound;
|
|
|
2666 }
|
|
|
2667
|
|
|
2668 static void
|
|
|
2669 iso2022_print (Lisp_Object cs, Lisp_Object printcharfun, int escapeflag)
|
|
|
2670 {
|
|
|
2671 int i;
|
|
|
2672
|
|
826
|
2673 write_c_string (printcharfun, "(");
|
|
771
|
2674 for (i = 0; i < 4; i++)
|
|
|
2675 {
|
|
|
2676 Lisp_Object charset = coding_system_charset (cs, i);
|
|
|
2677 if (i > 0)
|
|
826
|
2678 write_c_string (printcharfun, ", ");
|
|
771
|
2679 write_fmt_string (printcharfun, "g%d=", i);
|
|
800
|
2680 print_internal (CHARSETP (charset) ? XCHARSET_NAME (charset) : charset, printcharfun, 0);
|
|
771
|
2681 if (XCODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT (cs, i))
|
|
826
|
2682 write_c_string (printcharfun, "(force)");
|
|
771
|
2683 }
|
|
|
2684
|
|
800
|
2685 #define FROB(prop) \
|
|
|
2686 if (!NILP (iso2022_getprop (cs, prop))) \
|
|
|
2687 { \
|
|
|
2688 write_fmt_string (printcharfun, ", %s", prop); \
|
|
771
|
2689 }
|
|
|
2690
|
|
|
2691 FROB (Qshort);
|
|
|
2692 FROB (Qno_ascii_eol);
|
|
|
2693 FROB (Qno_ascii_cntl);
|
|
|
2694 FROB (Qseven);
|
|
|
2695 FROB (Qlock_shift);
|
|
|
2696 FROB (Qno_iso6429);
|
|
|
2697 FROB (Qescape_quoted);
|
|
|
2698
|
|
|
2699 {
|
|
|
2700 Lisp_Object val =
|
|
|
2701 unparse_charset_conversion_specs
|
|
|
2702 (XCODING_SYSTEM_ISO2022_INPUT_CONV (cs), 1);
|
|
|
2703 if (!NILP (val))
|
|
|
2704 {
|
|
800
|
2705 write_fmt_string_lisp (printcharfun, ", input-charset-conversion=%s", 1, val);
|
|
771
|
2706 }
|
|
|
2707 val =
|
|
|
2708 unparse_charset_conversion_specs
|
|
|
2709 (XCODING_SYSTEM_ISO2022_OUTPUT_CONV (cs), 1);
|
|
|
2710 if (!NILP (val))
|
|
|
2711 {
|
|
800
|
2712 write_fmt_string_lisp (printcharfun, ", output-charset-conversion=%s", 1, val);
|
|
771
|
2713 }
|
|
826
|
2714 write_c_string (printcharfun, ")");
|
|
771
|
2715 }
|
|
|
2716 }
|
|
|
2717
|
|
|
2718
|
|
|
2719 /************************************************************************/
|
|
|
2720 /* ISO2022 detector */
|
|
|
2721 /************************************************************************/
|
|
|
2722
|
|
|
2723 DEFINE_DETECTOR (iso2022);
|
|
|
2724 /* ISO2022 system using only seven-bit bytes, no locking shift */
|
|
|
2725 DEFINE_DETECTOR_CATEGORY (iso2022, iso_7);
|
|
|
2726 /* ISO2022 system using eight-bit bytes, no locking shift, no single shift,
|
|
|
2727 using designation to switch charsets */
|
|
|
2728 DEFINE_DETECTOR_CATEGORY (iso2022, iso_8_designate);
|
|
|
2729 /* ISO2022 system using eight-bit bytes, no locking shift, no designation
|
|
|
2730 sequences, one-dimension characters in the upper half. */
|
|
|
2731 DEFINE_DETECTOR_CATEGORY (iso2022, iso_8_1);
|
|
|
2732 /* ISO2022 system using eight-bit bytes, no locking shift, no designation
|
|
|
2733 sequences, two-dimension characters in the upper half. */
|
|
|
2734 DEFINE_DETECTOR_CATEGORY (iso2022, iso_8_2);
|
|
|
2735 /* ISO2022 system using locking shift */
|
|
|
2736 DEFINE_DETECTOR_CATEGORY (iso2022, iso_lock_shift);
|
|
|
2737
|
|
|
2738 struct iso2022_detector
|
|
|
2739 {
|
|
|
2740 int initted;
|
|
|
2741 struct iso2022_coding_stream *iso;
|
|
|
2742 unsigned int flags;
|
|
|
2743
|
|
|
2744 /* for keeping temporary track of high-byte groups */
|
|
|
2745 int high_byte_count;
|
|
|
2746 unsigned int saw_single_shift_just_now:1;
|
|
|
2747
|
|
|
2748 /* running state; we set the likelihoods at the end */
|
|
|
2749 unsigned int seen_high_byte:1;
|
|
|
2750 unsigned int seen_single_shift:1;
|
|
|
2751 unsigned int seen_locking_shift:1;
|
|
|
2752 unsigned int seen_designate:1;
|
|
|
2753 unsigned int bad_single_byte_sequences;
|
|
|
2754 unsigned int bad_multibyte_escape_sequences;
|
|
|
2755 unsigned int good_multibyte_escape_sequences;
|
|
|
2756 int even_high_byte_groups;
|
|
985
|
2757 int longest_even_high_byte;
|
|
771
|
2758 int odd_high_byte_groups;
|
|
|
2759 };
|
|
|
2760
|
|
|
2761 static void
|
|
|
2762 iso2022_detect (struct detection_state *st, const UExtbyte *src,
|
|
|
2763 Bytecount n)
|
|
|
2764 {
|
|
|
2765 Bytecount orign = n;
|
|
|
2766 struct iso2022_detector *data = DETECTION_STATE_DATA (st, iso2022);
|
|
|
2767
|
|
|
2768 /* #### There are serious deficiencies in the recognition mechanism
|
|
|
2769 here. This needs to be much smarter if it's going to cut it.
|
|
|
2770 The sequence "\xff\x0f" is currently detected as LOCK_SHIFT while
|
|
|
2771 it should be detected as Latin-1.
|
|
|
2772 All the ISO2022 stuff in this file should be synced up with the
|
|
|
2773 code from FSF Emacs-21.0, in which Mule should be more or less stable.
|
|
|
2774 Perhaps we should wait till R2L works in FSF Emacs? */
|
|
|
2775
|
|
|
2776 /* We keep track of running state on our own, and set the categories at the
|
|
|
2777 end; that way we can reflect the correct state each time we finish, but
|
|
|
2778 not get confused by those results the next time around. */
|
|
|
2779
|
|
|
2780 if (!data->initted)
|
|
|
2781 {
|
|
|
2782 xzero (*data);
|
|
|
2783 data->iso = xnew_and_zero (struct iso2022_coding_stream);
|
|
|
2784 reset_iso2022_decode (Qnil, data->iso);
|
|
|
2785 data->initted = 1;
|
|
|
2786 }
|
|
|
2787
|
|
|
2788 while (n--)
|
|
|
2789 {
|
|
|
2790 UExtbyte c = *src++;
|
|
|
2791 if (c >= 0x80)
|
|
|
2792 data->seen_high_byte = 1;
|
|
|
2793 if (c >= 0xA0)
|
|
|
2794 data->high_byte_count++;
|
|
|
2795 else
|
|
|
2796 {
|
|
|
2797 if (data->high_byte_count &&
|
|
|
2798 !data->saw_single_shift_just_now)
|
|
|
2799 {
|
|
|
2800 if (data->high_byte_count & 1)
|
|
|
2801 data->odd_high_byte_groups++;
|
|
|
2802 else
|
|
985
|
2803 {
|
|
|
2804 data->even_high_byte_groups++;
|
|
|
2805 if (data->longest_even_high_byte < data->high_byte_count)
|
|
|
2806 data->longest_even_high_byte = data->high_byte_count;
|
|
|
2807 }
|
|
771
|
2808 }
|
|
|
2809 data->high_byte_count = 0;
|
|
|
2810 data->saw_single_shift_just_now = 0;
|
|
|
2811 }
|
|
|
2812 if (!(data->flags & ISO_STATE_ESCAPE)
|
|
826
|
2813 && (byte_c0_p (c) || byte_c1_p (c)))
|
|
771
|
2814 { /* control chars */
|
|
|
2815 switch (c)
|
|
|
2816 {
|
|
|
2817 /* Allow and ignore control characters that you might
|
|
|
2818 reasonably see in a text file */
|
|
|
2819 case '\r':
|
|
|
2820 case '\n':
|
|
|
2821 case '\t':
|
|
|
2822 case 7: /* bell */
|
|
|
2823 case 8: /* backspace */
|
|
|
2824 case 11: /* vertical tab */
|
|
|
2825 case 12: /* form feed */
|
|
|
2826 case 26: /* MS-DOS C-z junk */
|
|
|
2827 case 31: /* '^_' -- for info */
|
|
|
2828 goto label_continue_loop;
|
|
|
2829
|
|
|
2830 default:
|
|
|
2831 break;
|
|
|
2832 }
|
|
|
2833 }
|
|
|
2834
|
|
826
|
2835 if ((data->flags & ISO_STATE_ESCAPE) || byte_c0_p (c)
|
|
|
2836 || byte_c1_p (c))
|
|
771
|
2837 {
|
|
|
2838 switch (parse_iso2022_esc (Qnil, data->iso, c,
|
|
|
2839 &data->flags, 0))
|
|
|
2840 {
|
|
|
2841 case 1: /* done */
|
|
|
2842 if (data->iso->esc_bytes_index > 0)
|
|
|
2843 data->good_multibyte_escape_sequences++;
|
|
|
2844 switch (data->iso->esc)
|
|
|
2845 {
|
|
|
2846 case ISO_ESC_DESIGNATE:
|
|
|
2847 data->seen_designate = 1;
|
|
|
2848 break;
|
|
|
2849 case ISO_ESC_LOCKING_SHIFT:
|
|
|
2850 data->seen_locking_shift = 1;
|
|
|
2851 break;
|
|
|
2852 case ISO_ESC_SINGLE_SHIFT:
|
|
|
2853 data->saw_single_shift_just_now = 1;
|
|
|
2854 data->seen_single_shift = 1;
|
|
|
2855 break;
|
|
|
2856 default:
|
|
|
2857 break;
|
|
|
2858 }
|
|
|
2859 break;
|
|
|
2860
|
|
|
2861 case -1: /* not done */
|
|
|
2862 break;
|
|
|
2863
|
|
|
2864 case 0: /* error */
|
|
|
2865 if (data->iso->esc == ISO_ESC_NOTHING)
|
|
|
2866 data->bad_single_byte_sequences++;
|
|
|
2867 else
|
|
|
2868 data->bad_multibyte_escape_sequences++;
|
|
|
2869 }
|
|
|
2870 }
|
|
|
2871 label_continue_loop:;
|
|
|
2872 }
|
|
|
2873
|
|
985
|
2874 if (data->high_byte_count &&
|
|
|
2875 !data->saw_single_shift_just_now)
|
|
|
2876 {
|
|
|
2877 if (data->high_byte_count & 1)
|
|
|
2878 data->odd_high_byte_groups++;
|
|
|
2879 else
|
|
|
2880 {
|
|
|
2881 data->even_high_byte_groups++;
|
|
|
2882 if (data->longest_even_high_byte < data->high_byte_count)
|
|
|
2883 data->longest_even_high_byte = data->high_byte_count;
|
|
|
2884 }
|
|
|
2885 }
|
|
|
2886
|
|
771
|
2887 if (data->bad_multibyte_escape_sequences > 2 ||
|
|
|
2888 (data->bad_multibyte_escape_sequences > 0 &&
|
|
|
2889 data->good_multibyte_escape_sequences /
|
|
|
2890 data->bad_multibyte_escape_sequences < 10))
|
|
|
2891 /* Just making it up ... */
|
|
|
2892 SET_DET_RESULTS (st, iso2022, DET_NEARLY_IMPOSSIBLE);
|
|
|
2893 else if (data->bad_single_byte_sequences > 5 ||
|
|
|
2894 (data->bad_single_byte_sequences > 0 &&
|
|
|
2895 (data->good_multibyte_escape_sequences +
|
|
|
2896 data->even_high_byte_groups +
|
|
|
2897 data->odd_high_byte_groups) /
|
|
|
2898 data->bad_single_byte_sequences < 10))
|
|
|
2899 SET_DET_RESULTS (st, iso2022, DET_SOMEWHAT_UNLIKELY);
|
|
|
2900 else if (data->seen_locking_shift)
|
|
|
2901 {
|
|
|
2902 SET_DET_RESULTS (st, iso2022, DET_QUITE_IMPROBABLE);
|
|
|
2903 DET_RESULT (st, iso_lock_shift) = DET_QUITE_PROBABLE;
|
|
|
2904 }
|
|
|
2905 else if (!data->seen_high_byte)
|
|
|
2906 {
|
|
|
2907 SET_DET_RESULTS (st, iso2022, DET_SOMEWHAT_UNLIKELY);
|
|
|
2908 if (data->good_multibyte_escape_sequences)
|
|
|
2909 DET_RESULT (st, iso_7) = DET_QUITE_PROBABLE;
|
|
|
2910 else if (data->seen_single_shift)
|
|
|
2911 DET_RESULT (st, iso_7) = DET_SOMEWHAT_LIKELY;
|
|
|
2912 else
|
|
|
2913 {
|
|
|
2914 /* If we've just seen pure 7-bit data, no escape sequences,
|
|
|
2915 then we can't give much likelihood; but if we've seen enough
|
|
|
2916 of this data, we can assume some unlikelihood of any 8-bit
|
|
|
2917 encoding */
|
|
|
2918 if (orign + st->bytes_seen >= 1000)
|
|
|
2919 DET_RESULT (st, iso_7) = DET_AS_LIKELY_AS_UNLIKELY;
|
|
|
2920 else
|
|
|
2921 SET_DET_RESULTS (st, iso2022, DET_AS_LIKELY_AS_UNLIKELY);
|
|
|
2922 }
|
|
|
2923 }
|
|
|
2924 else if (data->seen_designate)
|
|
|
2925 {
|
|
|
2926 SET_DET_RESULTS (st, iso2022, DET_QUITE_IMPROBABLE);
|
|
|
2927 if (data->seen_single_shift)
|
|
|
2928 /* #### Does this really make sense? */
|
|
|
2929 DET_RESULT (st, iso_8_designate) = DET_SOMEWHAT_UNLIKELY;
|
|
|
2930 else
|
|
|
2931 DET_RESULT (st, iso_8_designate) = DET_QUITE_PROBABLE;
|
|
|
2932 }
|
|
|
2933 else if (data->odd_high_byte_groups > 0 &&
|
|
|
2934 data->even_high_byte_groups == 0)
|
|
|
2935 {
|
|
|
2936 SET_DET_RESULTS (st, iso2022, DET_SOMEWHAT_UNLIKELY);
|
|
|
2937 if (data->seen_single_shift)
|
|
|
2938 DET_RESULT (st, iso_8_1) = DET_QUITE_PROBABLE;
|
|
|
2939 else
|
|
|
2940 DET_RESULT (st, iso_8_1) = DET_SOMEWHAT_LIKELY;
|
|
|
2941 }
|
|
|
2942 else if (data->odd_high_byte_groups == 0 &&
|
|
|
2943 data->even_high_byte_groups > 0)
|
|
|
2944 {
|
|
985
|
2945 #if 0
|
|
771
|
2946 SET_DET_RESULTS (st, iso2022, DET_SOMEWHAT_UNLIKELY);
|
|
|
2947 if (data->even_high_byte_groups > 10)
|
|
|
2948 {
|
|
|
2949 if (data->seen_single_shift)
|
|
|
2950 DET_RESULT (st, iso_8_2) = DET_QUITE_PROBABLE;
|
|
|
2951 else
|
|
|
2952 DET_RESULT (st, iso_8_2) = DET_SOMEWHAT_LIKELY;
|
|
|
2953 if (data->even_high_byte_groups < 50)
|
|
|
2954 DET_RESULT (st, iso_8_1) = DET_SOMEWHAT_UNLIKELY;
|
|
|
2955 /* else it stays at quite improbable */
|
|
|
2956 }
|
|
985
|
2957 #else
|
|
|
2958 SET_DET_RESULTS (st, iso2022, DET_SOMEWHAT_UNLIKELY);
|
|
|
2959 if (data->seen_single_shift)
|
|
|
2960 DET_RESULT (st, iso_8_2) = DET_QUITE_PROBABLE;
|
|
|
2961 else if (data->even_high_byte_groups > 10)
|
|
|
2962 DET_RESULT (st, iso_8_2) = DET_SOMEWHAT_LIKELY;
|
|
|
2963 else if (data->longest_even_high_byte > 6)
|
|
|
2964 DET_RESULT (st, iso_8_2) = DET_SLIGHTLY_LIKELY;
|
|
|
2965 #endif
|
|
771
|
2966 }
|
|
|
2967 else if (data->odd_high_byte_groups > 0 &&
|
|
|
2968 data->even_high_byte_groups > 0)
|
|
|
2969 SET_DET_RESULTS (st, iso2022, DET_SOMEWHAT_UNLIKELY);
|
|
|
2970 else
|
|
|
2971 SET_DET_RESULTS (st, iso2022, DET_AS_LIKELY_AS_UNLIKELY);
|
|
|
2972 }
|
|
|
2973
|
|
|
2974 static void
|
|
|
2975 iso2022_finalize_detection_state (struct detection_state *st)
|
|
|
2976 {
|
|
|
2977 struct iso2022_detector *data = DETECTION_STATE_DATA (st, iso2022);
|
|
|
2978 if (data->iso)
|
|
|
2979 xfree (data->iso);
|
|
|
2980 }
|
|
|
2981
|
|
|
2982
|
|
|
2983 /************************************************************************/
|
|
|
2984 /* CCL methods */
|
|
|
2985 /************************************************************************/
|
|
|
2986
|
|
|
2987 /* Converter written in CCL. */
|
|
|
2988 DEFINE_CODING_SYSTEM_TYPE (ccl);
|
|
|
2989
|
|
|
2990 struct ccl_coding_system
|
|
|
2991 {
|
|
|
2992 /* For a CCL coding system, these specify the CCL programs used for
|
|
|
2993 decoding (input) and encoding (output). */
|
|
|
2994 Lisp_Object decode;
|
|
|
2995 Lisp_Object encode;
|
|
|
2996 };
|
|
|
2997
|
|
|
2998 #define CODING_SYSTEM_CCL_DECODE(codesys) \
|
|
|
2999 (CODING_SYSTEM_TYPE_DATA (codesys, ccl)->decode)
|
|
|
3000 #define CODING_SYSTEM_CCL_ENCODE(codesys) \
|
|
|
3001 (CODING_SYSTEM_TYPE_DATA (codesys, ccl)->encode)
|
|
|
3002 #define XCODING_SYSTEM_CCL_DECODE(codesys) \
|
|
|
3003 CODING_SYSTEM_CCL_DECODE (XCODING_SYSTEM (codesys))
|
|
|
3004 #define XCODING_SYSTEM_CCL_ENCODE(codesys) \
|
|
|
3005 CODING_SYSTEM_CCL_ENCODE (XCODING_SYSTEM (codesys))
|
|
|
3006
|
|
|
3007 struct ccl_coding_stream
|
|
|
3008 {
|
|
|
3009 /* state of the running CCL program */
|
|
|
3010 struct ccl_program ccl;
|
|
|
3011 };
|
|
|
3012
|
|
|
3013 static const struct lrecord_description ccl_coding_system_description[] = {
|
|
|
3014 { XD_LISP_OBJECT,
|
|
|
3015 coding_system_data_offset + offsetof (struct ccl_coding_system,
|
|
|
3016 decode) },
|
|
|
3017 { XD_LISP_OBJECT,
|
|
|
3018 coding_system_data_offset + offsetof (struct ccl_coding_system,
|
|
|
3019 encode) },
|
|
|
3020 { XD_END }
|
|
|
3021 };
|
|
|
3022
|
|
|
3023 static void
|
|
|
3024 ccl_mark (Lisp_Object codesys)
|
|
|
3025 {
|
|
|
3026 mark_object (XCODING_SYSTEM_CCL_DECODE (codesys));
|
|
|
3027 mark_object (XCODING_SYSTEM_CCL_ENCODE (codesys));
|
|
|
3028 }
|
|
|
3029
|
|
|
3030 static Bytecount
|
|
|
3031 ccl_convert (struct coding_stream *str, const UExtbyte *src,
|
|
|
3032 unsigned_char_dynarr *dst, Bytecount n)
|
|
|
3033 {
|
|
|
3034 struct ccl_coding_stream *data =
|
|
|
3035 CODING_STREAM_TYPE_DATA (str, ccl);
|
|
|
3036 Bytecount orign = n;
|
|
|
3037
|
|
|
3038 data->ccl.last_block = str->eof;
|
|
|
3039 /* When applying a CCL program to a stream, SRC must not be NULL -- this
|
|
|
3040 is a special signal to the driver that read and write operations are
|
|
|
3041 not allowed. The code does not actually look at what SRC points to if
|
|
|
3042 N == 0.
|
|
|
3043 */
|
|
|
3044 ccl_driver (&data->ccl, src ? src : (const unsigned char *) "",
|
|
|
3045 dst, n, 0,
|
|
|
3046 str->direction == CODING_DECODE ? CCL_MODE_DECODING :
|
|
|
3047 CCL_MODE_ENCODING);
|
|
|
3048 return orign;
|
|
|
3049 }
|
|
|
3050
|
|
|
3051 static void
|
|
|
3052 ccl_init_coding_stream (struct coding_stream *str)
|
|
|
3053 {
|
|
|
3054 struct ccl_coding_stream *data =
|
|
|
3055 CODING_STREAM_TYPE_DATA (str, ccl);
|
|
|
3056
|
|
|
3057 setup_ccl_program (&data->ccl,
|
|
|
3058 str->direction == CODING_DECODE ?
|
|
|
3059 XCODING_SYSTEM_CCL_DECODE (str->codesys) :
|
|
|
3060 XCODING_SYSTEM_CCL_ENCODE (str->codesys));
|
|
|
3061 }
|
|
|
3062
|
|
|
3063 static void
|
|
|
3064 ccl_rewind_coding_stream (struct coding_stream *str)
|
|
|
3065 {
|
|
|
3066 ccl_init_coding_stream (str);
|
|
|
3067 }
|
|
|
3068
|
|
|
3069 static void
|
|
|
3070 ccl_init (Lisp_Object codesys)
|
|
|
3071 {
|
|
|
3072 XCODING_SYSTEM_CCL_DECODE (codesys) = Qnil;
|
|
|
3073 XCODING_SYSTEM_CCL_ENCODE (codesys) = Qnil;
|
|
|
3074 }
|
|
|
3075
|
|
|
3076 static int
|
|
|
3077 ccl_putprop (Lisp_Object codesys, Lisp_Object key, Lisp_Object value)
|
|
|
3078 {
|
|
|
3079 Lisp_Object sym;
|
|
|
3080 struct ccl_program test_ccl;
|
|
|
3081 Char_ASCII *suffix;
|
|
|
3082
|
|
|
3083 /* Check key first. */
|
|
|
3084 if (EQ (key, Qdecode))
|
|
|
3085 suffix = "-ccl-decode";
|
|
|
3086 else if (EQ (key, Qencode))
|
|
|
3087 suffix = "-ccl-encode";
|
|
|
3088 else
|
|
|
3089 return 0;
|
|
|
3090
|
|
|
3091 /* If value is vector, register it as a ccl program
|
|
|
3092 associated with a newly created symbol for
|
|
|
3093 backward compatibility.
|
|
|
3094
|
|
|
3095 #### Bogosity alert! Do we really have to do this crap???? --ben */
|
|
|
3096 if (VECTORP (value))
|
|
|
3097 {
|
|
|
3098 sym = Fintern (concat2 (Fsymbol_name (XCODING_SYSTEM_NAME (codesys)),
|
|
|
3099 build_string (suffix)),
|
|
|
3100 Qnil);
|
|
|
3101 Fregister_ccl_program (sym, value);
|
|
|
3102 }
|
|
|
3103 else
|
|
|
3104 {
|
|
|
3105 CHECK_SYMBOL (value);
|
|
|
3106 sym = value;
|
|
|
3107 }
|
|
|
3108 /* check if the given ccl programs are valid. */
|
|
|
3109 if (setup_ccl_program (&test_ccl, sym) < 0)
|
|
|
3110 invalid_argument ("Invalid CCL program", value);
|
|
|
3111
|
|
|
3112 if (EQ (key, Qdecode))
|
|
|
3113 XCODING_SYSTEM_CCL_DECODE (codesys) = sym;
|
|
|
3114 else if (EQ (key, Qencode))
|
|
|
3115 XCODING_SYSTEM_CCL_ENCODE (codesys) = sym;
|
|
|
3116
|
|
|
3117 return 1;
|
|
|
3118 }
|
|
|
3119
|
|
|
3120 static Lisp_Object
|
|
|
3121 ccl_getprop (Lisp_Object coding_system, Lisp_Object prop)
|
|
|
3122 {
|
|
|
3123 if (EQ (prop, Qdecode))
|
|
|
3124 return XCODING_SYSTEM_CCL_DECODE (coding_system);
|
|
|
3125 else if (EQ (prop, Qencode))
|
|
|
3126 return XCODING_SYSTEM_CCL_ENCODE (coding_system);
|
|
|
3127 else
|
|
|
3128 return Qunbound;
|
|
|
3129 }
|
|
|
3130
|
|
|
3131
|
|
|
3132 /************************************************************************/
|
|
|
3133 /* Initialization */
|
|
|
3134 /************************************************************************/
|
|
|
3135
|
|
|
3136 void
|
|
|
3137 syms_of_mule_coding (void)
|
|
|
3138 {
|
|
|
3139 DEFSUBR (Fdecode_shift_jis_char);
|
|
|
3140 DEFSUBR (Fencode_shift_jis_char);
|
|
|
3141 DEFSUBR (Fdecode_big5_char);
|
|
|
3142 DEFSUBR (Fencode_big5_char);
|
|
|
3143
|
|
|
3144 DEFSYMBOL (Qbig5);
|
|
|
3145 DEFSYMBOL (Qshift_jis);
|
|
|
3146 DEFSYMBOL (Qccl);
|
|
|
3147 DEFSYMBOL (Qiso2022);
|
|
|
3148
|
|
|
3149 DEFSYMBOL (Qcharset_g0);
|
|
|
3150 DEFSYMBOL (Qcharset_g1);
|
|
|
3151 DEFSYMBOL (Qcharset_g2);
|
|
|
3152 DEFSYMBOL (Qcharset_g3);
|
|
|
3153 DEFSYMBOL (Qforce_g0_on_output);
|
|
|
3154 DEFSYMBOL (Qforce_g1_on_output);
|
|
|
3155 DEFSYMBOL (Qforce_g2_on_output);
|
|
|
3156 DEFSYMBOL (Qforce_g3_on_output);
|
|
|
3157 DEFSYMBOL (Qno_iso6429);
|
|
|
3158 DEFSYMBOL (Qinput_charset_conversion);
|
|
|
3159 DEFSYMBOL (Qoutput_charset_conversion);
|
|
|
3160
|
|
|
3161 DEFSYMBOL (Qshort);
|
|
|
3162 DEFSYMBOL (Qno_ascii_eol);
|
|
|
3163 DEFSYMBOL (Qno_ascii_cntl);
|
|
|
3164 DEFSYMBOL (Qseven);
|
|
|
3165 DEFSYMBOL (Qlock_shift);
|
|
|
3166
|
|
|
3167 DEFSYMBOL (Qiso_7);
|
|
|
3168 DEFSYMBOL (Qiso_8_designate);
|
|
|
3169 DEFSYMBOL (Qiso_8_1);
|
|
|
3170 DEFSYMBOL (Qiso_8_2);
|
|
|
3171 DEFSYMBOL (Qiso_lock_shift);
|
|
|
3172 }
|
|
|
3173
|
|
|
3174 void
|
|
|
3175 coding_system_type_create_mule_coding (void)
|
|
|
3176 {
|
|
|
3177 INITIALIZE_CODING_SYSTEM_TYPE_WITH_DATA (iso2022, "iso2022-coding-system-p");
|
|
|
3178 CODING_SYSTEM_HAS_METHOD (iso2022, mark);
|
|
|
3179 CODING_SYSTEM_HAS_METHOD (iso2022, convert);
|
|
|
3180 CODING_SYSTEM_HAS_METHOD (iso2022, finalize_coding_stream);
|
|
|
3181 CODING_SYSTEM_HAS_METHOD (iso2022, init_coding_stream);
|
|
|
3182 CODING_SYSTEM_HAS_METHOD (iso2022, rewind_coding_stream);
|
|
|
3183 CODING_SYSTEM_HAS_METHOD (iso2022, init);
|
|
|
3184 CODING_SYSTEM_HAS_METHOD (iso2022, print);
|
|
|
3185 CODING_SYSTEM_HAS_METHOD (iso2022, finalize);
|
|
|
3186 CODING_SYSTEM_HAS_METHOD (iso2022, putprop);
|
|
|
3187 CODING_SYSTEM_HAS_METHOD (iso2022, getprop);
|
|
|
3188
|
|
|
3189 INITIALIZE_DETECTOR (iso2022);
|
|
|
3190 DETECTOR_HAS_METHOD (iso2022, detect);
|
|
|
3191 DETECTOR_HAS_METHOD (iso2022, finalize_detection_state);
|
|
|
3192 INITIALIZE_DETECTOR_CATEGORY (iso2022, iso_7);
|
|
|
3193 INITIALIZE_DETECTOR_CATEGORY (iso2022, iso_8_designate);
|
|
|
3194 INITIALIZE_DETECTOR_CATEGORY (iso2022, iso_8_1);
|
|
|
3195 INITIALIZE_DETECTOR_CATEGORY (iso2022, iso_8_2);
|
|
|
3196 INITIALIZE_DETECTOR_CATEGORY (iso2022, iso_lock_shift);
|
|
|
3197
|
|
|
3198 INITIALIZE_CODING_SYSTEM_TYPE_WITH_DATA (ccl, "ccl-coding-system-p");
|
|
|
3199 CODING_SYSTEM_HAS_METHOD (ccl, mark);
|
|
|
3200 CODING_SYSTEM_HAS_METHOD (ccl, convert);
|
|
|
3201 CODING_SYSTEM_HAS_METHOD (ccl, init);
|
|
|
3202 CODING_SYSTEM_HAS_METHOD (ccl, init_coding_stream);
|
|
|
3203 CODING_SYSTEM_HAS_METHOD (ccl, rewind_coding_stream);
|
|
|
3204 CODING_SYSTEM_HAS_METHOD (ccl, putprop);
|
|
|
3205 CODING_SYSTEM_HAS_METHOD (ccl, getprop);
|
|
|
3206
|
|
|
3207 INITIALIZE_CODING_SYSTEM_TYPE (shift_jis, "shift-jis-coding-system-p");
|
|
|
3208 CODING_SYSTEM_HAS_METHOD (shift_jis, convert);
|
|
|
3209
|
|
|
3210 INITIALIZE_DETECTOR (shift_jis);
|
|
|
3211 DETECTOR_HAS_METHOD (shift_jis, detect);
|
|
|
3212 INITIALIZE_DETECTOR_CATEGORY (shift_jis, shift_jis);
|
|
|
3213
|
|
|
3214 INITIALIZE_CODING_SYSTEM_TYPE (big5, "big5-coding-system-p");
|
|
|
3215 CODING_SYSTEM_HAS_METHOD (big5, convert);
|
|
|
3216
|
|
|
3217 INITIALIZE_DETECTOR (big5);
|
|
|
3218 DETECTOR_HAS_METHOD (big5, detect);
|
|
|
3219 INITIALIZE_DETECTOR_CATEGORY (big5, big5);
|
|
|
3220 }
|
|
|
3221
|
|
|
3222 void
|
|
|
3223 reinit_coding_system_type_create_mule_coding (void)
|
|
|
3224 {
|
|
|
3225 REINITIALIZE_CODING_SYSTEM_TYPE (iso2022);
|
|
|
3226 REINITIALIZE_CODING_SYSTEM_TYPE (ccl);
|
|
|
3227 REINITIALIZE_CODING_SYSTEM_TYPE (shift_jis);
|
|
|
3228 REINITIALIZE_CODING_SYSTEM_TYPE (big5);
|
|
|
3229 }
|
|
|
3230
|
|
|
3231 void
|
|
|
3232 reinit_vars_of_mule_coding (void)
|
|
|
3233 {
|
|
|
3234 }
|
|
|
3235
|
|
|
3236 void
|
|
|
3237 vars_of_mule_coding (void)
|
|
|
3238 {
|
|
|
3239 }
|
